diff --git a/src/test/typescript-service-helpers.ts b/src/test/typescript-service-helpers.ts
index 180556989..084229775 100644
--- a/src/test/typescript-service-helpers.ts
+++ b/src/test/typescript-service-helpers.ts
@@ -26,7 +26,7 @@ export interface TestContext {
  * @param createService A factory that creates the TypeScript service. Allows to test subclasses of TypeScriptService
  * @param files A Map from URI to file content of files that should be available in the workspace
  */
-export const initializeTypeScriptService = (createService: TypeScriptServiceFactory, files: Map<string, string>) => async function (this: TestContext): Promise<void> {
+export const initializeTypeScriptService = (createService: TypeScriptServiceFactory, rootUri: string, files: Map<string, string>) => async function (this: TestContext): Promise<void> {
 	this.service = createService({
 		textDocumentXcontent(params: TextDocumentContentParams): Promise<TextDocumentItem> {
 			if (!files.has(params.textDocument.uri)) {
@@ -54,7 +54,7 @@ export const initializeTypeScriptService = (createService: TypeScriptServiceFact
 	});
 	await this.service.initialize({
 		processId: process.pid,
-		rootUri: 'file:///',
+		rootUri,
 		capabilities: {
 			xcontentProvider: true,
 			xfilesProvider: true
@@ -74,23 +74,23 @@ export async function shutdownTypeScriptService(this: TestContext): Promise<void
  *
  * @param createService Factory function to create the TypeScriptService instance to describe
  */
-export function describeTypeScriptService(createService: TypeScriptServiceFactory, shutdownService = shutdownTypeScriptService) {
+export function describeTypeScriptService(createService: TypeScriptServiceFactory, shutdownService = shutdownTypeScriptService, rootUri: string) {
 
 	describe('Workspace without project files', function (this: TestContext) {
 
-		beforeEach(initializeTypeScriptService(createService, new Map([
-			['file:///a.ts', 'const abc = 1; console.log(abc);'],
-			['file:///foo/b.ts', [
+		beforeEach(initializeTypeScriptService(createService, rootUri, new Map([
+			[rootUri + 'a.ts', 'const abc = 1; console.log(abc);'],
+			[rootUri + 'foo/b.ts', [
 				'/* This is class Foo */',
 				'export class Foo {}'
 			].join('\n')],
-			['file:///foo/c.ts', 'import {Foo} from "./b";'],
-			['file:///d.ts', [
+			[rootUri + 'foo/c.ts', 'import {Foo} from "./b";'],
+			[rootUri + 'd.ts', [
 				'export interface I {',
 				'  target: string;',
 				'}'
 			].join('\n')],
-			['file:///e.ts', [
+			[rootUri + 'e.ts', [
 				'import * as d from "./d";',
 				'',
 				'let i: d.I = { target: "hi" };',
@@ -104,7 +104,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 			specify('in same file', async function (this: TestContext) {
 				const result = await this.service.textDocumentDefinition({
 					textDocument: {
-						uri: 'file:///a.ts'
+						uri: rootUri + 'a.ts'
 					},
 					position: {
 						line: 0,
@@ -112,7 +112,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 					}
 				});
 				assert.deepEqual(result, [{
-					uri: 'file:///a.ts',
+					uri: rootUri + 'a.ts',
 					range: {
 						start: {
 							line: 0,
@@ -128,7 +128,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 			specify('on keyword (non-null)', async function (this: TestContext) {
 				const result = await this.service.textDocumentDefinition({
 					textDocument: {
-						uri: 'file:///a.ts'
+						uri: rootUri + 'a.ts'
 					},
 					position: {
 						line: 0,
@@ -140,7 +140,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 			specify('in other file', async function (this: TestContext) {
 				const result = await this.service.textDocumentDefinition({
 					textDocument: {
-						uri: 'file:///foo/c.ts'
+						uri: rootUri + 'foo/c.ts'
 					},
 					position: {
 						line: 0,
@@ -148,7 +148,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 					}
 				});
 				assert.deepEqual(result, [{
-					uri: 'file:///foo/b.ts',
+					uri: rootUri + 'foo/b.ts',
 					range: {
 						start: {
 							line: 1,
@@ -166,7 +166,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 			specify('on interface field reference', async function (this: TestContext) {
 				const result = await this.service.textDocumentXdefinition({
 					textDocument: {
-						uri: 'file:///e.ts'
+						uri: rootUri + 'e.ts'
 					},
 					position: {
 						line: 3,
@@ -175,7 +175,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 				}).toPromise();
 				assert.deepEqual(result, [{
 					location: {
-						uri: 'file:///d.ts',
+						uri: rootUri + 'd.ts',
 						range: {
 							start: {
 								line: 1,
@@ -198,7 +198,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 			specify('in same file', async function (this: TestContext) {
 				const result = await this.service.textDocumentXdefinition({
 					textDocument: {
-						uri: 'file:///a.ts'
+						uri: rootUri + 'a.ts'
 					},
 					position: {
 						line: 0,
@@ -207,7 +207,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 				}).toPromise();
 				assert.deepEqual(result, [{
 					location: {
-						uri: 'file:///a.ts',
+						uri: rootUri + 'a.ts',
 						range: {
 							start: {
 								line: 0,
@@ -232,7 +232,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 			specify('in same file', async function (this: TestContext) {
 				const result = await this.service.textDocumentHover({
 					textDocument: {
-						uri: 'file:///a.ts'
+						uri: rootUri + 'a.ts'
 					},
 					position: {
 						line: 0,
@@ -259,7 +259,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 			specify('in other file', async function (this: TestContext) {
 				const result = await this.service.textDocumentHover({
 					textDocument: {
-						uri: 'file:///foo/c.ts'
+						uri: rootUri + 'foo/c.ts'
 					},
 					position: {
 						line: 0,
@@ -286,7 +286,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 			specify('over keyword (non-null)', async function (this: TestContext) {
 				const result = await this.service.textDocumentHover({
 					textDocument: {
-						uri: 'file:///a.ts'
+						uri: rootUri + 'a.ts'
 					},
 					position: {
 						line: 0,
@@ -298,7 +298,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 			specify('over non-existent file', function (this: TestContext) {
 				return assert.isRejected(this.service.textDocumentHover({
 					textDocument: {
-						uri: 'file:///foo/a.ts'
+						uri: rootUri + 'foo/a.ts'
 					},
 					position: {
 						line: 0,
@@ -311,10 +311,10 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 
 	describe('Workspace with typings directory', function (this: TestContext) {
 
-		beforeEach(initializeTypeScriptService(createService, new Map([
-			['file:///src/a.ts', "import * as m from 'dep';"],
-			['file:///typings/dep.d.ts', "declare module 'dep' {}"],
-			['file:///src/tsconfig.json', [
+		beforeEach(initializeTypeScriptService(createService, rootUri, new Map([
+			[rootUri + 'src/a.ts', "import * as m from 'dep';"],
+			[rootUri + 'typings/dep.d.ts', "declare module 'dep' {}"],
+			[rootUri + 'src/tsconfig.json', [
 				'{',
 				'  "compilerOptions": {',
 				'    "target": "ES5",',
@@ -326,8 +326,8 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 				'  }',
 				'}'
 			].join('\n')],
-			['file:///src/tsd.d.ts', '/// <reference path="../typings/dep.d.ts" />'],
-			['file:///src/dir/index.ts', 'import * as m from "dep";']
+			[rootUri + 'src/tsd.d.ts', '/// <reference path="../typings/dep.d.ts" />'],
+			[rootUri + 'src/dir/index.ts', 'import * as m from "dep";']
 		])) as any);
 
 		afterEach(shutdownService as any);
@@ -336,7 +336,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 			specify('with tsd.d.ts', async function (this: TestContext) {
 				const result = await this.service.textDocumentDefinition({
 					textDocument: {
-						uri: 'file:///src/dir/index.ts'
+						uri: rootUri + 'src/dir/index.ts'
 					},
 					position: {
 						line: 0,
@@ -344,7 +344,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 					}
 				});
 				assert.deepEqual(result, [{
-					uri: 'file:///typings/dep.d.ts',
+					uri: rootUri + 'typings/dep.d.ts',
 					range: {
 						start: {
 							line: 0,
@@ -361,7 +361,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 				specify('on import alias', async function (this: TestContext) {
 					const result = await this.service.textDocumentDefinition({
 						textDocument: {
-							uri: 'file:///src/a.ts'
+							uri: rootUri + 'src/a.ts'
 						},
 						position: {
 							line: 0,
@@ -369,7 +369,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 						}
 					});
 					assert.deepEqual(result, [{
-						uri: 'file:///typings/dep.d.ts',
+						uri: rootUri + 'typings/dep.d.ts',
 						range: {
 							start: {
 								line: 0,
@@ -385,7 +385,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 				specify('on module name', async function (this: TestContext) {
 					const result = await this.service.textDocumentDefinition({
 						textDocument: {
-							uri: 'file:///src/a.ts'
+							uri: rootUri + 'src/a.ts'
 						},
 						position: {
 							line: 0,
@@ -393,7 +393,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 						}
 					});
 					assert.deepEqual(result, [{
-						uri: 'file:///typings/dep.d.ts',
+						uri: rootUri + 'typings/dep.d.ts',
 						range: {
 							start: {
 								line: 0,
@@ -411,8 +411,8 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 	} as any);
 
 	describe('DefinitelyTyped', function (this: TestContext) {
-		beforeEach(initializeTypeScriptService(createService, new Map([
-			['file:///package.json', JSON.stringify({
+		beforeEach(initializeTypeScriptService(createService, rootUri, new Map([
+			[rootUri + 'package.json', JSON.stringify({
 				private: true,
 				name: 'definitely-typed',
 				version: '0.0.1',
@@ -439,14 +439,14 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 					'types-publisher': 'Microsoft/types-publisher#production'
 				}
 			}, null, 4)],
-			['file:///types/resolve/index.d.ts', [
+			[rootUri + 'types/resolve/index.d.ts', [
 				'/// <reference types="node" />',
 				'',
 				'type resolveCallback = (err: Error, resolved?: string) => void;',
 				'declare function resolve(id: string, cb: resolveCallback): void;',
 				''
 			].join('\n')],
-			['file:///types/resolve/tsconfig.json', JSON.stringify({
+			[rootUri + 'types/resolve/tsconfig.json', JSON.stringify({
 				compilerOptions: {
 					module: 'commonjs',
 					lib: [
@@ -467,14 +467,14 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 					'index.d.ts'
 				]
 			})],
-			['file:///types/notResolve/index.d.ts', [
+			[rootUri + 'types/notResolve/index.d.ts', [
 				'/// <reference types="node" />',
 				'',
 				'type resolveCallback = (err: Error, resolved?: string) => void;',
 				'declare function resolve(id: string, cb: resolveCallback): void;',
 				''
 			].join('\n')],
-			['file:///types/notResolve/tsconfig.json', JSON.stringify({
+			[rootUri + 'types/notResolve/tsconfig.json', JSON.stringify({
 				compilerOptions: {
 					module: 'commonjs',
 					lib: [
@@ -518,7 +518,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 								line: 2
 							}
 						},
-						uri: 'file:///types/resolve/index.d.ts'
+						uri: rootUri + 'types/resolve/index.d.ts'
 					},
 					name: 'resolveCallback'
 				}]);
@@ -541,7 +541,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 								line: 2
 							}
 						},
-						uri: 'file:///types/resolve/index.d.ts'
+						uri: rootUri + 'types/resolve/index.d.ts'
 					},
 					name: 'resolveCallback'
 				}]);
@@ -551,12 +551,12 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 
 	describe('Workspace with root package.json', function (this: TestContext) {
 
-		beforeEach(initializeTypeScriptService(createService, new Map([
-			['file:///a.ts', 'class a { foo() { const i = 1;} }'],
-			['file:///foo/b.ts', 'class b { bar: number; baz(): number { return this.bar;}}; function qux() {}'],
-			['file:///c.ts', 'import { x } from "dep/dep";'],
-			['file:///package.json', '{ "name": "mypkg" }'],
-			['file:///node_modules/dep/dep.ts', 'export var x = 1;']
+		beforeEach(initializeTypeScriptService(createService, rootUri, new Map([
+			[rootUri + 'a.ts', 'class a { foo() { const i = 1;} }'],
+			[rootUri + 'foo/b.ts', 'class b { bar: number; baz(): number { return this.bar;}}; function qux() {}'],
+			[rootUri + 'c.ts', 'import { x } from "dep/dep";'],
+			[rootUri + 'package.json', '{ "name": "mypkg" }'],
+			[rootUri + 'node_modules/dep/dep.ts', 'export var x = 1;']
 		])) as any);
 
 		afterEach(shutdownService as any);
@@ -586,7 +586,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 									line: 0
 								}
 							},
-							uri: 'file:///a.ts'
+							uri: rootUri + 'a.ts'
 						},
 						name: 'a'
 					}]);
@@ -609,7 +609,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 									line: 0
 								}
 							},
-							uri: 'file:///a.ts'
+							uri: rootUri + 'a.ts'
 						},
 						name: 'a'
 					}]);
@@ -633,7 +633,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 									line: 0
 								}
 							},
-							uri: 'file:///a.ts'
+							uri: rootUri + 'a.ts'
 						},
 						name: 'a'
 					}]);
@@ -667,7 +667,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 									line: 0
 								}
 							},
-							uri: 'file:///a.ts'
+							uri: rootUri + 'a.ts'
 						},
 						name: 'a'
 					}]);
@@ -679,7 +679,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 							name: 'a',
 							kind: SymbolKind.Class,
 							location: {
-								uri: 'file:///a.ts',
+								uri: rootUri + 'a.ts',
 								range: {
 									start: {
 										line: 0,
@@ -696,7 +696,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 							name: 'foo',
 							kind: SymbolKind.Method,
 							location: {
-								uri: 'file:///a.ts',
+								uri: rootUri + 'a.ts',
 								range: {
 									start: {
 										line: 0,
@@ -714,7 +714,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 							name: 'i',
 							kind: SymbolKind.Constant,
 							location: {
-								uri: 'file:///a.ts',
+								uri: rootUri + 'a.ts',
 								range: {
 									start: {
 										line: 0,
@@ -732,7 +732,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 							name: 'x',
 							kind: SymbolKind.Variable,
 							location: {
-								uri: 'file:///c.ts',
+								uri: rootUri + 'c.ts',
 								range: {
 									start: {
 										line: 0,
@@ -749,7 +749,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 							name: 'b',
 							kind: SymbolKind.Class,
 							location: {
-								uri: 'file:///foo/b.ts',
+								uri: rootUri + 'foo/b.ts',
 								range: {
 									start: {
 										line: 0,
@@ -766,7 +766,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 							name: 'bar',
 							kind: SymbolKind.Property,
 							location: {
-								uri: 'file:///foo/b.ts',
+								uri: rootUri + 'foo/b.ts',
 								range: {
 									start: {
 										line: 0,
@@ -784,7 +784,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 							name: 'baz',
 							kind: SymbolKind.Method,
 							location: {
-								uri: 'file:///foo/b.ts',
+								uri: rootUri + 'foo/b.ts',
 								range: {
 									start: {
 										line: 0,
@@ -802,7 +802,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 							name: 'qux',
 							kind: SymbolKind.Function,
 							location: {
-								uri: 'file:///foo/b.ts',
+								uri: rootUri + 'foo/b.ts',
 								range: {
 									start: {
 										line: 0,
@@ -824,7 +824,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 							name: 'a',
 							kind: SymbolKind.Class,
 							location: {
-								uri: 'file:///a.ts',
+								uri: rootUri + 'a.ts',
 								range: {
 									start: {
 										line: 0,
@@ -863,7 +863,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 								line: 0
 							}
 						},
-						uri: 'file:///a.ts'
+						uri: rootUri + 'a.ts'
 					}
 				}]);
 			} as any);
@@ -887,7 +887,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 								line: 0
 							}
 						},
-						uri: 'file:///a.ts'
+						uri: rootUri + 'a.ts'
 					}
 				}]);
 			} as any);
@@ -909,7 +909,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 								line: 0
 							}
 						},
-						uri: 'file:///c.ts'
+						uri: rootUri + 'c.ts'
 					},
 					symbol: {
 						containerKind: '',
@@ -940,7 +940,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 									line: 0
 								}
 							},
-							uri: 'file:///a.ts'
+							uri: rootUri + 'a.ts'
 						}
 					},
 					{
@@ -961,7 +961,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 									line: 0
 								}
 							},
-							uri: 'file:///a.ts'
+							uri: rootUri + 'a.ts'
 						}
 					},
 					{
@@ -982,7 +982,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 									line: 0
 								}
 							},
-							uri: 'file:///a.ts'
+							uri: rootUri + 'a.ts'
 						}
 					},
 					{
@@ -997,7 +997,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 									line: 0
 								}
 							},
-							uri: 'file:///c.ts'
+							uri: rootUri + 'c.ts'
 						},
 						symbol: {
 							containerKind: '',
@@ -1024,7 +1024,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 									line: 0
 								}
 							},
-							uri: 'file:///foo/b.ts'
+							uri: rootUri + 'foo/b.ts'
 						}
 					},
 					{
@@ -1045,7 +1045,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 									line: 0
 								}
 							},
-							uri: 'file:///foo/b.ts'
+							uri: rootUri + 'foo/b.ts'
 						}
 					},
 					{
@@ -1066,7 +1066,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 									line: 0
 								}
 							},
-							uri: 'file:///foo/b.ts'
+							uri: rootUri + 'foo/b.ts'
 						}
 					},
 					{
@@ -1087,7 +1087,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 									line: 0
 								}
 							},
-							uri: 'file:///foo/b.ts'
+							uri: rootUri + 'foo/b.ts'
 						}
 					},
 					{
@@ -1108,7 +1108,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 									line: 0
 								}
 							},
-							uri: 'file:///foo/b.ts'
+							uri: rootUri + 'foo/b.ts'
 						}
 					}
 				]);
@@ -1118,8 +1118,8 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 
 	describe('Dependency detection', function (this: TestContext) {
 
-		beforeEach(initializeTypeScriptService(createService, new Map([
-			['file:///package.json', JSON.stringify({
+		beforeEach(initializeTypeScriptService(createService, rootUri, new Map([
+			[rootUri + 'package.json', JSON.stringify({
 				name: 'tslint',
 				version: '4.0.2',
 				dependencies: {
@@ -1138,13 +1138,13 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 					typescript: '>=2.0.0'
 				}
 			})],
-			['file:///node_modules/dep/package.json', JSON.stringify({
+			[rootUri + 'node_modules/dep/package.json', JSON.stringify({
 				name: 'foo',
 				dependencies: {
 					shouldnotinclude: '0.0.0'
 				}
 			})],
-			['file:///subproject/package.json', JSON.stringify({
+			[rootUri + 'subproject/package.json', JSON.stringify({
 				name: 'subproject',
 				repository: {
 					url: 'https://github.com/my/subproject'
@@ -1209,8 +1209,8 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 	} as any);
 
 	describe('TypeScript library', function (this: TestContext) {
-		beforeEach(initializeTypeScriptService(createService, new Map([
-			['file:///a.ts', 'let parameters = [];']
+		beforeEach(initializeTypeScriptService(createService, rootUri, new Map([
+			[rootUri + 'a.ts', 'let parameters = [];']
 		])) as any);
 
 		afterEach(shutdownService as any);
@@ -1218,7 +1218,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 		specify('type of parameters should be any[]', async function (this: TestContext) {
 			const result = await this.service.textDocumentHover({
 				textDocument: {
-					uri: 'file:///a.ts'
+					uri: rootUri + 'a.ts'
 				},
 				position: {
 					line: 0,
@@ -1246,8 +1246,8 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 
 	describe('Live updates', function (this: TestContext) {
 
-		beforeEach(initializeTypeScriptService(createService, new Map([
-			['file:///a.ts', 'let parameters = [];']
+		beforeEach(initializeTypeScriptService(createService, rootUri, new Map([
+			[rootUri + 'a.ts', 'let parameters = [];']
 		])) as any);
 
 		afterEach(shutdownService as any);
@@ -1256,7 +1256,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 
 			const hoverParams = {
 				textDocument: {
-					uri: 'file:///a.ts'
+					uri: rootUri + 'a.ts'
 				},
 				position: {
 					line: 0,
@@ -1277,7 +1277,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 
 			await this.service.textDocumentDidChange({
 				textDocument: {
-					uri: 'file:///a.ts',
+					uri: rootUri + 'a.ts',
 					version: 1
 				},
 				contentChanges: [{
@@ -1298,7 +1298,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 
 			const hoverParams = {
 				textDocument: {
-					uri: 'file:///a.ts'
+					uri: rootUri + 'a.ts'
 				},
 				position: {
 					line: 0,
@@ -1319,7 +1319,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 
 			await this.service.textDocumentDidClose({
 				textDocument: {
-					uri: 'file:///a.ts'
+					uri: rootUri + 'a.ts'
 				}
 			});
 
@@ -1336,7 +1336,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 
 			const hoverParams = {
 				textDocument: {
-					uri: 'file:///a.ts'
+					uri: rootUri + 'a.ts'
 				},
 				position: {
 					line: 0,
@@ -1365,7 +1365,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 
 			await this.service.textDocumentDidOpen({
 				textDocument: {
-					uri: 'file:///a.ts',
+					uri: rootUri + 'a.ts',
 					languageId: 'typescript',
 					version: 1,
 					text: 'let parameters: string[]'
@@ -1382,7 +1382,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 
 			await this.service.textDocumentDidChange({
 				textDocument: {
-					uri: 'file:///a.ts',
+					uri: rootUri + 'a.ts',
 					version: 2
 				},
 				contentChanges: [{
@@ -1400,7 +1400,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 
 			await this.service.textDocumentDidClose({
 				textDocument: {
-					uri: 'file:///a.ts'
+					uri: rootUri + 'a.ts'
 				}
 			});
 
@@ -1415,19 +1415,19 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 	} as any);
 
 	describe('References and imports', function (this: TestContext) {
-		beforeEach(initializeTypeScriptService(createService, new Map([
-			['file:///a.ts', '/// <reference path="b.ts"/>\nnamespace qux {let f : foo;}'],
-			['file:///b.ts', '/// <reference path="foo/c.ts"/>'],
-			['file:///c.ts', 'import * as d from "./foo/d"\nd.bar()'],
-			['file:///foo/c.ts', 'namespace qux {export interface foo {}}'],
-			['file:///foo/d.ts', 'export function bar() {}'],
-			['file:///deeprefs/a.ts', '/// <reference path="b.ts"/>\nnamespace qux {\nlet f : foo;\n}'],
-			['file:///deeprefs/b.ts', '/// <reference path="c.ts"/>'],
-			['file:///deeprefs/c.ts', '/// <reference path="d.ts"/>'],
-			['file:///deeprefs/d.ts', '/// <reference path="e.ts"/>'],
-			['file:///deeprefs/e.ts', 'namespace qux {\nexport interface foo {}\n}'],
-			['file:///missing/a.ts', '/// <reference path="b.ts"/>\n/// <reference path="missing.ts"/>\nnamespace t {\n    function foo() : Bar {\n        return null;\n    }\n}'],
-			['file:///missing/b.ts', 'namespace t {\n    export interface Bar {\n        id?: number;\n    }}']
+		beforeEach(initializeTypeScriptService(createService, rootUri, new Map([
+			[rootUri + 'a.ts', '/// <reference path="b.ts"/>\nnamespace qux {let f : foo;}'],
+			[rootUri + 'b.ts', '/// <reference path="foo/c.ts"/>'],
+			[rootUri + 'c.ts', 'import * as d from "./foo/d"\nd.bar()'],
+			[rootUri + 'foo/c.ts', 'namespace qux {export interface foo {}}'],
+			[rootUri + 'foo/d.ts', 'export function bar() {}'],
+			[rootUri + 'deeprefs/a.ts', '/// <reference path="b.ts"/>\nnamespace qux {\nlet f : foo;\n}'],
+			[rootUri + 'deeprefs/b.ts', '/// <reference path="c.ts"/>'],
+			[rootUri + 'deeprefs/c.ts', '/// <reference path="d.ts"/>'],
+			[rootUri + 'deeprefs/d.ts', '/// <reference path="e.ts"/>'],
+			[rootUri + 'deeprefs/e.ts', 'namespace qux {\nexport interface foo {}\n}'],
+			[rootUri + 'missing/a.ts', '/// <reference path="b.ts"/>\n/// <reference path="missing.ts"/>\nnamespace t {\n    function foo() : Bar {\n        return null;\n    }\n}'],
+			[rootUri + 'missing/b.ts', 'namespace t {\n    export interface Bar {\n        id?: number;\n    }}']
 		])) as any);
 
 		afterEach(shutdownService as any);
@@ -1436,7 +1436,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 			it('should resolve symbol imported with tripe-slash reference', async function (this: TestContext) {
 				const result = await this.service.textDocumentDefinition({
 					textDocument: {
-						uri: 'file:///a.ts'
+						uri: rootUri + 'a.ts'
 					},
 					position: {
 						line: 1,
@@ -1452,7 +1452,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 					// omission. (It would probably show up in the
 					// definition response if the user has already
 					// navigated to deeprefs/e.ts.)
-					uri: 'file:///foo/c.ts',
+					uri: rootUri + 'foo/c.ts',
 					range: {
 						start: {
 							line: 0,
@@ -1468,7 +1468,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 			it('should resolve symbol imported with import statement', async function (this: TestContext) {
 				const result = await this.service.textDocumentDefinition({
 					textDocument: {
-						uri: 'file:///c.ts'
+						uri: rootUri + 'c.ts'
 					},
 					position: {
 						line: 1,
@@ -1476,7 +1476,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 					}
 				});
 				assert.deepEqual(result, [{
-					uri: 'file:///foo/d.ts',
+					uri: rootUri + 'foo/d.ts',
 					range: {
 						start: {
 							line: 0,
@@ -1492,7 +1492,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 			it('should resolve definition with missing reference', async function (this: TestContext) {
 				const result = await this.service.textDocumentDefinition({
 					textDocument: {
-						uri: 'file:///missing/a.ts'
+						uri: rootUri + 'missing/a.ts'
 					},
 					position: {
 						line: 3,
@@ -1500,7 +1500,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 					}
 				});
 				assert.deepEqual(result, [{
-					uri: 'file:///missing/b.ts',
+					uri: rootUri + 'missing/b.ts',
 					range: {
 						start: {
 							line: 1,
@@ -1519,7 +1519,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 				// This test will fail once we'll increase (or remove) depth limit
 				const result = await this.service.textDocumentDefinition({
 					textDocument: {
-						uri: 'file:///deeprefs/a.ts'
+						uri: rootUri + 'deeprefs/a.ts'
 					},
 					position: {
 						line: 2,
@@ -1527,7 +1527,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 					}
 				});
 				assert.deepEqual(result, [{
-					uri: 'file:///deeprefs/e.ts',
+					uri: rootUri + 'deeprefs/e.ts',
 					range: {
 						start: {
 							line: 1,
@@ -1544,13 +1544,13 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 	} as any);
 
 	describe('TypeScript libraries', function (this: TestContext) {
-		beforeEach(initializeTypeScriptService(createService, new Map([
-				['file:///tsconfig.json', JSON.stringify({
+		beforeEach(initializeTypeScriptService(createService, rootUri, new Map([
+				[rootUri + 'tsconfig.json', JSON.stringify({
 					compilerOptions: {
 						lib: ['es2016', 'dom']
 					}
 				})],
-				['file:///a.ts', 'function foo(n: Node): {console.log(n.parentNode, NaN})}']
+				[rootUri + 'a.ts', 'function foo(n: Node): {console.log(n.parentNode, NaN})}']
 		])) as any);
 
 		afterEach(shutdownService as any);
@@ -1559,7 +1559,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 			it('should load local library file', async function (this: TestContext) {
 				const result = await this.service.textDocumentHover({
 					textDocument: {
-						uri: 'file:///a.ts'
+						uri: rootUri + 'a.ts'
 					},
 					position: {
 						line: 0,
@@ -1610,7 +1610,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 			it('should resolve TS libraries to github URL', async function (this: TestContext) {
 				assert.deepEqual(await this.service.textDocumentDefinition({
 					textDocument: {
-						uri: 'file:///a.ts'
+						uri: rootUri + 'a.ts'
 					},
 					position: {
 						line: 0,
@@ -1644,7 +1644,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 
 				assert.deepEqual(await this.service.textDocumentDefinition({
 					textDocument: {
-						uri: 'file:///a.ts'
+						uri: rootUri + 'a.ts'
 					},
 					position: {
 						line: 0,
@@ -1668,8 +1668,8 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 	} as any);
 
 	describe('textDocumentReferences()', function (this: TestContext) {
-		beforeEach(initializeTypeScriptService(createService, new Map([
-			['file:///a.ts', [
+		beforeEach(initializeTypeScriptService(createService, rootUri, new Map([
+			[rootUri + 'a.ts', [
 				'class A {',
 				'	/** foo doc*/',
 				'    foo() {}',
@@ -1687,15 +1687,15 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 				'const a = new A();',
 				'a.baz(32, sd)'
 			].join('\n')],
-			['file:///uses-import.ts', [
+			[rootUri + 'uses-import.ts', [
 				'import * as i from "./import"',
 				'i.d()'
 			].join('\n')],
-			['file:///also-uses-import.ts', [
+			[rootUri + 'also-uses-import.ts', [
 				'import {d} from "./import"',
 				'd()'
 			].join('\n')],
-			['file:///import.ts', '/** d doc*/ export function d() {}']
+			[rootUri + 'import.ts', '/** d doc*/ export function d() {}']
 		])) as any);
 
 		afterEach(shutdownService as any);
@@ -1703,7 +1703,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 		it('should provide an empty response when no reference is found', async function (this: TestContext) {
 			const result = await this.service.textDocumentReferences({
 				textDocument: {
-					uri: 'file:///a.ts'
+					uri: rootUri + 'a.ts'
 				},
 				position: {
 					line: 0,
@@ -1717,7 +1717,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 		it('should include the declaration if requested', async function (this: TestContext) {
 			const result = await this.service.textDocumentReferences({
 				textDocument: {
-					uri: 'file:///a.ts'
+					uri: rootUri + 'a.ts'
 				},
 				position: {
 					line: 4,
@@ -1736,14 +1736,14 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 						line: 4
 					}
 				},
-				uri: 'file:///a.ts'
+				uri: rootUri + 'a.ts'
 			}]);
 		} as any);
 
 		it('should provide a reference within the same file', async function (this: TestContext) {
 			const result = await this.service.textDocumentReferences({
 				textDocument: {
-					uri: 'file:///a.ts'
+					uri: rootUri + 'a.ts'
 				},
 				position: {
 					line: 10,
@@ -1762,13 +1762,13 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 						line: 15
 					}
 				},
-				uri: 'file:///a.ts'
+				uri: rootUri + 'a.ts'
 			}]);
 		} as any);
 		it('should provide two references from imports', async function (this: TestContext) {
 			const result = await this.service.textDocumentReferences({
 				textDocument: {
-					uri: 'file:///import.ts'
+					uri: rootUri + 'import.ts'
 				},
 				position: {
 					line: 0,
@@ -1788,7 +1788,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 							line: 1
 						}
 					},
-					uri: 'file:///uses-import.ts'
+					uri: rootUri + 'uses-import.ts'
 				},
 				{
 					range: {
@@ -1801,15 +1801,15 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 							line: 1
 						}
 					},
-					uri: 'file:///also-uses-import.ts'
+					uri: rootUri + 'also-uses-import.ts'
 				}
 			]);
 		} as any);
 	} as any);
 
 	describe('textDocumentSignatureHelp()', function (this: TestContext) {
-		beforeEach(initializeTypeScriptService(createService, new Map([
-			['file:///a.ts', [
+		beforeEach(initializeTypeScriptService(createService, rootUri, new Map([
+			[rootUri + 'a.ts', [
 				'class A {',
 				'	/** foo doc*/',
 				'    foo() {}',
@@ -1827,22 +1827,22 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 				'const a = new A();',
 				'a.baz(32, sd)'
 			].join('\n')],
-			['file:///uses-import.ts', [
+			[rootUri + 'uses-import.ts', [
 				'import * as i from "./import"',
 				'i.d()'
 			].join('\n')],
-			['file:///import.ts', '/** d doc*/ export function d() {}'],
-			['file:///uses-reference.ts', [
+			[rootUri + 'import.ts', '/** d doc*/ export function d() {}'],
+			[rootUri + 'uses-reference.ts', [
 				'/// <reference path="reference.ts" />',
 				'let z : foo.'
 			].join('\n')],
-			['file:///reference.ts', [
+			[rootUri + 'reference.ts', [
 				'namespace foo {',
 				'	/** bar doc*/',
 				'	export interface bar {}',
 				'}'
 			].join('\n')],
-			['file:///empty.ts', '']
+			[rootUri + 'empty.ts', '']
 		])) as any);
 
 		afterEach(shutdownService as any);
@@ -1850,7 +1850,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 		it('should provide a valid empty response when no signature is found', async function (this: TestContext) {
 			const result = await this.service.textDocumentSignatureHelp({
 				textDocument: {
-					uri: 'file:///a.ts'
+					uri: rootUri + 'a.ts'
 				},
 				position: {
 					line: 0,
@@ -1867,7 +1867,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 		it('should provide signature help with parameters in the same file', async function (this: TestContext) {
 			const result = await this.service.textDocumentSignatureHelp({
 				textDocument: {
-					uri: 'file:///a.ts'
+					uri: rootUri + 'a.ts'
 				},
 				position: {
 					line: 15,
@@ -1896,7 +1896,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 		it('should provide signature help from imported symbols', async function (this: TestContext) {
 			const result = await this.service.textDocumentSignatureHelp({
 				textDocument: {
-					uri: 'file:///uses-import.ts'
+					uri: rootUri + 'uses-import.ts'
 				},
 				position: {
 					line: 1,
@@ -1917,8 +1917,8 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 	} as any);
 
 	describe('textDocumentCompletion()', function (this: TestContext) {
-		beforeEach(initializeTypeScriptService(createService, new Map([
-			['file:///a.ts', [
+		beforeEach(initializeTypeScriptService(createService, rootUri, new Map([
+			[rootUri + 'a.ts', [
 				'class A {',
 				'	/** foo doc*/',
 				'    foo() {}',
@@ -1932,22 +1932,22 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 				'const a = new A();',
 				'a.'
 			].join('\n')],
-			['file:///uses-import.ts', [
+			[rootUri + 'uses-import.ts', [
 				'import * as i from "./import"',
 				'i.'
 			].join('\n')],
-			['file:///import.ts', '/** d doc*/ export function d() {}'],
-			['file:///uses-reference.ts', [
+			[rootUri + 'import.ts', '/** d doc*/ export function d() {}'],
+			[rootUri + 'uses-reference.ts', [
 				'/// <reference path="reference.ts" />',
 				'let z : foo.'
 			].join('\n')],
-			['file:///reference.ts', [
+			[rootUri + 'reference.ts', [
 				'namespace foo {',
 				'	/** bar doc*/',
 				'	export interface bar {}',
 				'}'
 			].join('\n')],
-			['file:///empty.ts', '']
+			[rootUri + 'empty.ts', '']
 		])) as any);
 
 		afterEach(shutdownService as any);
@@ -1955,7 +1955,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 		it('produces completions in the same file', async function (this: TestContext) {
 			const result = await this.service.textDocumentCompletion({
 				textDocument: {
-					uri: 'file:///a.ts'
+					uri: rootUri + 'a.ts'
 				},
 				position: {
 					line: 11,
@@ -1997,7 +1997,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 		it('produces completions for imported symbols', async function (this: TestContext) {
 			const result = await this.service.textDocumentCompletion({
 				textDocument: {
-					uri: 'file:///uses-import.ts'
+					uri: rootUri + 'uses-import.ts'
 				},
 				position: {
 					line: 1,
@@ -2018,7 +2018,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 		it('produces completions for referenced symbols', async function (this: TestContext) {
 			const result = await this.service.textDocumentCompletion({
 				textDocument: {
-					uri: 'file:///uses-reference.ts'
+					uri: rootUri + 'uses-reference.ts'
 				},
 				position: {
 					line: 1,
@@ -2039,7 +2039,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 		it('produces completions for empty files', async function (this: TestContext) {
 			const result = await this.service.textDocumentCompletion({
 				textDocument: {
-					uri: 'file:///empty.ts'
+					uri: rootUri + 'empty.ts'
 				},
 				position: {
 					line: 0,
@@ -2052,12 +2052,12 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 
 	describe('Special file names', function (this: TestContext) {
 
-		beforeEach(initializeTypeScriptService(createService, new Map([
-			['file:///keywords-in-path/class/constructor/a.ts', 'export function a() {}'],
-			['file:///special-characters-in-path/%40foo/b.ts', 'export function b() {}'],
-			['file:///windows/app/master.ts', '/// <reference path="..\\lib\\master.ts" />\nc();'],
-			['file:///windows/lib/master.ts', '/// <reference path="..\\lib\\slave.ts" />'],
-			['file:///windows/lib/slave.ts', 'function c() {}']
+		beforeEach(initializeTypeScriptService(createService, rootUri, new Map([
+			[rootUri + 'keywords-in-path/class/constructor/a.ts', 'export function a() {}'],
+			[rootUri + 'special-characters-in-path/%40foo/b.ts', 'export function b() {}'],
+			[rootUri + 'windows/app/master.ts', '/// <reference path="..\\lib\\master.ts" />\nc();'],
+			[rootUri + 'windows/lib/master.ts', '/// <reference path="..\\lib\\slave.ts" />'],
+			[rootUri + 'windows/lib/slave.ts', 'function c() {}']
 		])) as any);
 
 		afterEach(shutdownService as any);
@@ -2065,7 +2065,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 		it('should accept files with TypeScript keywords in path', async function (this: TestContext) {
 			const result = await this.service.textDocumentHover({
 				textDocument: {
-					uri: 'file:///keywords-in-path/class/constructor/a.ts'
+					uri: rootUri + 'keywords-in-path/class/constructor/a.ts'
 				},
 				position: {
 					line: 0,
@@ -2092,7 +2092,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 		it('should accept files with special characters in path', async function (this: TestContext) {
 			const result = await this.service.textDocumentHover({
 				textDocument: {
-					uri: 'file:///special-characters-in-path/%40foo/b.ts'
+					uri: rootUri + 'special-characters-in-path/%40foo/b.ts'
 				},
 				position: {
 					line: 0,
@@ -2119,7 +2119,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 		it('should handle Windows-style paths in triple slash references', async function (this: TestContext) {
 			const result = await this.service.textDocumentDefinition({
 				textDocument: {
-					uri: 'file:///windows/app/master.ts'
+					uri: rootUri + 'windows/app/master.ts'
 				},
 				position: {
 					line: 1,
@@ -2137,7 +2137,7 @@ export function describeTypeScriptService(createService: TypeScriptServiceFactor
 						character: 10
 					}
 				},
-				uri: 'file:///windows/lib/slave.ts'
+				uri: rootUri + 'windows/lib/slave.ts'
 			}]);
 		} as any);
 	} as any);
diff --git a/src/test/typescript-service.test.ts b/src/test/typescript-service.test.ts
index 0fccc9595..d5d7161ea 100644
--- a/src/test/typescript-service.test.ts
+++ b/src/test/typescript-service.test.ts
@@ -3,5 +3,9 @@ import {TypeScriptService} from '../typescript-service';
 import {describeTypeScriptService} from './typescript-service-helpers';
 
 describe('TypeScriptService', () => {
-	describeTypeScriptService((client, options) => new TypeScriptService(client, options));
+	for (const rootUri of ['file:///', 'file:///c:/foo/bar/', 'file:///foo/bar/']) {
+		describe(`rootUri ${rootUri}`, () => {
+			describeTypeScriptService((client, options) => new TypeScriptService(client, options), undefined, rootUri);
+		});
+	}
 });
diff --git a/src/util.ts b/src/util.ts
index d5cf9a5f6..9f08c677e 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -90,7 +90,7 @@ export function path2uri(root: string, file: string): string {
 	} else {
 		p = file;
 	}
-	p = toUnixPath(p).split('/').map(encodeURIComponent).join('/');
+	p = toUnixPath(p).split('/').map((val, i) => i <= 1 && /^[a-z]:$/i.test(val) ? val : encodeURIComponent(val)).join('/');
 	return ret + p;
 }