diff --git a/src/vs/base/common/resources.ts b/src/vs/base/common/resources.ts
index c55d331661e662accfcf86f7afa9dc44d3dbcfc9..40095c3aaa5f170eb621fb88d2debac30ec7a222 100644
--- a/src/vs/base/common/resources.ts
+++ b/src/vs/base/common/resources.ts
@@ -146,7 +146,7 @@ export function normalizePath(resource: URI): URI {
 export function originalFSPath(uri: URI): string {
 	let value: string;
 	const uriPath = uri.path;
-	if (uri.authority && uriPath.length > 1 && uri.scheme === 'file') {
+	if (uri.authority && uriPath.length > 1 && uri.scheme === Schemas.file) {
 		// unc path: file://shares/c$/far/boo
 		value = `//${uri.authority}${uriPath}`;
 	} else if (
diff --git a/src/vs/platform/workspaces/common/workspaces.ts b/src/vs/platform/workspaces/common/workspaces.ts
index 380d16b25946dd615115c84fde2bf09ce2697f56..fa8fae57ec853c942d8e250c894e245f3c275d21 100644
--- a/src/vs/platform/workspaces/common/workspaces.ts
+++ b/src/vs/platform/workspaces/common/workspaces.ts
@@ -10,7 +10,7 @@ import { IWorkspaceFolder, IWorkspace } from 'vs/platform/workspace/common/works
 import { URI, UriComponents } from 'vs/base/common/uri';
 import { isWindows, isLinux, isMacintosh } from 'vs/base/common/platform';
 import { extname } from 'vs/base/common/path';
-import { dirname, resolvePath, isEqualAuthority, isEqualOrParent, relativePath } from 'vs/base/common/resources';
+import { dirname, resolvePath, isEqualAuthority, isEqualOrParent, relativePath, extname as resourceExtname } from 'vs/base/common/resources';
 import * as jsonEdit from 'vs/base/common/jsonEdit';
 import * as json from 'vs/base/common/json';
 import { Schemas } from 'vs/base/common/network';
@@ -158,8 +158,10 @@ export function isSingleFolderWorkspaceInitializationPayload(obj: any): obj is I
 
 const WORKSPACE_SUFFIX = '.' + WORKSPACE_EXTENSION;
 
-export function hasWorkspaceFileExtension(path: string) {
-	return extname(path) === WORKSPACE_SUFFIX;
+export function hasWorkspaceFileExtension(path: string | URI) {
+	const ext = (typeof path === 'string') ? extname(path) : resourceExtname(path);
+
+	return ext === WORKSPACE_SUFFIX;
 }
 
 const SLASH = '/';
diff --git a/src/vs/platform/workspaces/electron-main/workspacesMainService.ts b/src/vs/platform/workspaces/electron-main/workspacesMainService.ts
index 71f28a094c8cb40ddd570e52f4d2db4c3c4ae787..a7775611ea2c4e33bd2e899018fe23af9e273f89 100644
--- a/src/vs/platform/workspaces/electron-main/workspacesMainService.ts
+++ b/src/vs/platform/workspaces/electron-main/workspacesMainService.ts
@@ -61,7 +61,7 @@ export class WorkspacesMainService extends Disposable implements IWorkspacesMain
 	}
 
 	private isWorkspacePath(uri: URI): boolean {
-		return this.isInsideWorkspacesHome(uri) || hasWorkspaceFileExtension(uri.path);
+		return this.isInsideWorkspacesHome(uri) || hasWorkspaceFileExtension(uri);
 	}
 
 	private doResolveWorkspace(path: URI, contents: string): IResolvedWorkspace | null {
diff --git a/src/vs/workbench/api/common/apiCommands.ts b/src/vs/workbench/api/common/apiCommands.ts
index d0023a72b42ea6afb6fb633dc0bb1be201436a85..917e28c82fec395ad7762cbfb6747c67e8947e05 100644
--- a/src/vs/workbench/api/common/apiCommands.ts
+++ b/src/vs/workbench/api/common/apiCommands.ts
@@ -52,7 +52,7 @@ export class OpenFolderAPICommand {
 		}
 		const options: IOpenSettings = { forceNewWindow: arg.forceNewWindow, noRecentEntry: arg.noRecentEntry };
 		uri = URI.revive(uri);
-		const uriToOpen: IURIToOpen = (hasWorkspaceFileExtension(uri.path) || uri.scheme === Schemas.untitled) ? { workspaceUri: uri } : { folderUri: uri };
+		const uriToOpen: IURIToOpen = (hasWorkspaceFileExtension(uri) || uri.scheme === Schemas.untitled) ? { workspaceUri: uri } : { folderUri: uri };
 		return executor.executeCommand('_files.windowOpen', [uriToOpen], options);
 	}
 }
diff --git a/src/vs/workbench/browser/dnd.ts b/src/vs/workbench/browser/dnd.ts
index 74a04554f7acf884db5fe278376be874096134e1..5c4a13a5587f0b6e6bad562d54199519091c6084 100644
--- a/src/vs/workbench/browser/dnd.ts
+++ b/src/vs/workbench/browser/dnd.ts
@@ -260,7 +260,7 @@ export class ResourcesDropHandler {
 		return Promise.all(fileOnDiskResources.map(fileOnDiskResource => {
 
 			// Check for Workspace
-			if (hasWorkspaceFileExtension(fileOnDiskResource.fsPath)) {
+			if (hasWorkspaceFileExtension(fileOnDiskResource)) {
 				urisToOpen.push({ workspaceUri: fileOnDiskResource });
 
 				return undefined;
diff --git a/src/vs/workbench/browser/parts/editor/editorGroupView.ts b/src/vs/workbench/browser/parts/editor/editorGroupView.ts
index 710296c74e6bce0f9391515ec76f8cfc2903cca5..57d29393cafcab2e1955db483e3dfef9930971b2 100644
--- a/src/vs/workbench/browser/parts/editor/editorGroupView.ts
+++ b/src/vs/workbench/browser/parts/editor/editorGroupView.ts
@@ -47,7 +47,8 @@ import { IVisibleEditor } from 'vs/workbench/services/editor/common/editorServic
 import { withNullAsUndefined } from 'vs/base/common/types';
 import { hash } from 'vs/base/common/hash';
 import { guessMimeTypes } from 'vs/base/common/mime';
-import { extname } from 'vs/base/common/path';
+import { extname } from 'vs/base/common/resources';
+import { Schemas } from 'vs/base/common/network';
 
 export class EditorGroupView extends Themable implements IEditorGroupView {
 
@@ -520,8 +521,9 @@ export class EditorGroupView extends Themable implements IEditorGroupView {
 		const descriptor = editor.getTelemetryDescriptor();
 
 		const resource = editor.getResource();
-		if (resource && resource.fsPath) {
-			descriptor['resource'] = { mimeType: guessMimeTypes(resource.fsPath).join(', '), scheme: resource.scheme, ext: extname(resource.fsPath), path: hash(resource.fsPath) };
+		const path = resource ? resource.scheme === Schemas.file ? resource.fsPath : resource.path : undefined;
+		if (resource && path) {
+			descriptor['resource'] = { mimeType: guessMimeTypes(path).join(', '), scheme: resource.scheme, ext: extname(resource), path: hash(path) };
 
 			/* __GDPR__FRAGMENT__
 				"EditorTelemetryDescriptor" : {
diff --git a/src/vs/workbench/browser/parts/editor/editorWidgets.ts b/src/vs/workbench/browser/parts/editor/editorWidgets.ts
index 43ef52ce1147e7d19e9faec46426705a5da4716c..de5aacf53546efe94e52222b547706917280d30c 100644
--- a/src/vs/workbench/browser/parts/editor/editorWidgets.ts
+++ b/src/vs/workbench/browser/parts/editor/editorWidgets.ts
@@ -139,7 +139,7 @@ export class OpenWorkspaceButtonContribution extends Disposable implements IEdit
 			return false; // we need a model
 		}
 
-		if (!hasWorkspaceFileExtension(model.uri.fsPath)) {
+		if (!hasWorkspaceFileExtension(model.uri)) {
 			return false; // we need a workspace file
 		}
 
diff --git a/src/vs/workbench/browser/parts/titlebar/titlebarPart.ts b/src/vs/workbench/browser/parts/titlebar/titlebarPart.ts
index 88bc332cb9445a9193e5ec97229a9b42e0a7d8f1..d96209b11f30b7daf6a6fcba74ba165e4f7b49e9 100644
--- a/src/vs/workbench/browser/parts/titlebar/titlebarPart.ts
+++ b/src/vs/workbench/browser/parts/titlebar/titlebarPart.ts
@@ -36,6 +36,7 @@ import { IStorageService } from 'vs/platform/storage/common/storage';
 import { Parts, IWorkbenchLayoutService } from 'vs/workbench/services/layout/browser/layoutService';
 import { RunOnceScheduler } from 'vs/base/common/async';
 import { registerSingleton } from 'vs/platform/instantiation/common/extensions';
+import { Schemas } from 'vs/base/common/network';
 
 export class TitlebarPart extends Part implements ITitleService {
 
@@ -179,7 +180,7 @@ export class TitlebarPart extends Part implements ITitleService {
 	}
 
 	private updateRepresentedFilename(): void {
-		const file = toResource(this.editorService.activeEditor, { supportSideBySide: SideBySideEditor.MASTER, filterByScheme: 'file' });
+		const file = toResource(this.editorService.activeEditor, { supportSideBySide: SideBySideEditor.MASTER, filterByScheme: Schemas.file });
 		const path = file ? file.fsPath : '';
 
 		// Apply to window
diff --git a/src/vs/workbench/contrib/files/browser/files.contribution.ts b/src/vs/workbench/contrib/files/browser/files.contribution.ts
index 3b895621d09c52966a503159363c6492bdc28fca..a9375c40f8ad09186b1fc1f9f6047843d8253490 100644
--- a/src/vs/workbench/contrib/files/browser/files.contribution.ts
+++ b/src/vs/workbench/contrib/files/browser/files.contribution.ts
@@ -38,6 +38,7 @@ import { IWorkbenchLayoutService } from 'vs/workbench/services/layout/browser/la
 import { registerSingleton } from 'vs/platform/instantiation/common/extensions';
 import { ExplorerService } from 'vs/workbench/contrib/files/common/explorerService';
 import { SUPPORTED_ENCODINGS } from 'vs/workbench/services/textfile/common/textfiles';
+import { Schemas } from 'vs/base/common/network';
 
 // Viewlet Action
 export class OpenExplorerViewletAction extends ShowViewletAction {
@@ -59,7 +60,7 @@ class FileUriLabelContribution implements IWorkbenchContribution {
 
 	constructor(@ILabelService labelService: ILabelService) {
 		labelService.registerFormatter({
-			scheme: 'file',
+			scheme: Schemas.file,
 			formatting: {
 				label: '${authority}${path}',
 				separator: sep,
diff --git a/src/vs/workbench/services/textfile/common/textFileEditorModel.ts b/src/vs/workbench/services/textfile/common/textFileEditorModel.ts
index 765d33c3c5112701dfd865808a56857de63105b6..ce73adad88fb084beb15cb5ea685f8f85e033837 100644
--- a/src/vs/workbench/services/textfile/common/textFileEditorModel.ts
+++ b/src/vs/workbench/services/textfile/common/textFileEditorModel.ts
@@ -31,6 +31,7 @@ import { IDisposable, toDisposable } from 'vs/base/common/lifecycle';
 import { ILogService } from 'vs/platform/log/common/log';
 import { isEqual, isEqualOrParent, extname, basename } from 'vs/base/common/resources';
 import { onUnexpectedError } from 'vs/base/common/errors';
+import { Schemas } from 'vs/base/common/network';
 
 /**
  * The text file editor model listens to changes to its underlying code editor model and saves these changes through the file service back to the disk.
@@ -824,10 +825,11 @@ export class TextFileEditorModel extends BaseTextEditorModel implements ITextFil
 	private getTelemetryData(reason: number | undefined): object {
 		const ext = extname(this.resource);
 		const fileName = basename(this.resource);
+		const path = this.resource.scheme === Schemas.file ? this.resource.fsPath : this.resource.path;
 		const telemetryData = {
-			mimeType: guessMimeTypes(this.resource.fsPath).join(', '),
+			mimeType: guessMimeTypes(path).join(', '),
 			ext,
-			path: hash(this.resource.fsPath),
+			path: hash(path),
 			reason
 		};