diff --git a/src/vs/platform/files/common/files.ts b/src/vs/platform/files/common/files.ts
index 24188ef8c4df29d6b5624a13ffa21e529b7446d1..9ab1c0be2955bd07be1bd44f3118d5d89879f1e3 100644
--- a/src/vs/platform/files/common/files.ts
+++ b/src/vs/platform/files/common/files.ts
@@ -182,7 +182,8 @@ export enum FileSystemProviderCapabilities {
 	FileOpenReadWriteClose = 1 << 2,
 	FileFolderCopy = 1 << 3,
 
-	PathCaseSensitive = 1 << 10
+	PathCaseSensitive = 1 << 10,
+	Readonly = 1 << 11
 }
 
 export interface IFileSystemProvider {
@@ -411,6 +412,11 @@ export interface IFileStat extends IBaseStat {
 	 */
 	isDirectory: boolean;
 
+	/**
+	 * The resource is readonly.
+	 */
+	isReadonly?: boolean;
+
 	/**
 	 * The resource is a symbolic link.
 	 */
diff --git a/src/vs/vscode.d.ts b/src/vs/vscode.d.ts
index 60f7435509c808b66ed546172bf3990c1d3e20c2..026f84b57b10400f868886119e1a26f85b70a4e8 100644
--- a/src/vs/vscode.d.ts
+++ b/src/vs/vscode.d.ts
@@ -6863,7 +6863,7 @@ declare module 'vscode' {
 		 * @param options Immutable metadata about the provider.
 		 * @return A [disposable](#Disposable) that unregisters this provider when being disposed.
 		 */
-		export function registerFileSystemProvider(scheme: string, provider: FileSystemProvider, options?: { isCaseSensitive?: boolean }): Disposable;
+		export function registerFileSystemProvider(scheme: string, provider: FileSystemProvider, options?: { isCaseSensitive?: boolean, isReadonly?: boolean }): Disposable;
 	}
 
 	/**
diff --git a/src/vs/workbench/api/node/extHostFileSystem.ts b/src/vs/workbench/api/node/extHostFileSystem.ts
index 2fa4cc8844fe171668596f06b09c341e2782dc55..58f06eb2188b5e44ad4284c8b75d268c65e27b33 100644
--- a/src/vs/workbench/api/node/extHostFileSystem.ts
+++ b/src/vs/workbench/api/node/extHostFileSystem.ts
@@ -83,7 +83,7 @@ export class ExtHostFileSystem implements ExtHostFileSystemShape {
 		extHostLanguageFeatures.registerDocumentLinkProvider('*', this._linkProvider);
 	}
 
-	registerFileSystemProvider(scheme: string, provider: vscode.FileSystemProvider, options: { isCaseSensitive?: boolean } = {}) {
+	registerFileSystemProvider(scheme: string, provider: vscode.FileSystemProvider, options: { isCaseSensitive?: boolean, isReadonly?: boolean } = {}) {
 
 		if (this._usedSchemes.has(scheme)) {
 			throw new Error(`a provider for the scheme '${scheme}' is already registered`);
@@ -98,6 +98,9 @@ export class ExtHostFileSystem implements ExtHostFileSystemShape {
 		if (options.isCaseSensitive) {
 			capabilites += files.FileSystemProviderCapabilities.PathCaseSensitive;
 		}
+		if (options.isReadonly) {
+			capabilites += files.FileSystemProviderCapabilities.Readonly;
+		}
 		if (typeof provider.copy === 'function') {
 			capabilites += files.FileSystemProviderCapabilities.FileFolderCopy;
 		}
diff --git a/src/vs/workbench/services/files/electron-browser/fileService.ts b/src/vs/workbench/services/files/electron-browser/fileService.ts
index d8501eb66b0aee652bb0d4b36dd39c508ebbe94c..e2021d010ce14e5f5b5b735372ea573e0e4fb435 100644
--- a/src/vs/workbench/services/files/electron-browser/fileService.ts
+++ b/src/vs/workbench/services/files/electron-browser/fileService.ts
@@ -1129,6 +1129,7 @@ export class StatResolver {
 			resource: this.resource,
 			isDirectory: this.isDirectory,
 			isSymbolicLink: this.isSymbolicLink,
+			isReadonly: false,
 			name: this.name,
 			etag: this.etag,
 			size: this.size,
@@ -1213,6 +1214,7 @@ export class StatResolver {
 							resource: fileResource,
 							isDirectory: fileStat.isDirectory(),
 							isSymbolicLink,
+							isReadonly: false,
 							name: file,
 							mtime: fileStat.mtime.getTime(),
 							etag: etag(fileStat),
diff --git a/src/vs/workbench/services/files/electron-browser/remoteFileService.ts b/src/vs/workbench/services/files/electron-browser/remoteFileService.ts
index 0dca336c1a7888d7f043aae666af94bcc27dd1ae..d03b24db8bd82f8ee8db5c5e02192200ab39093c 100644
--- a/src/vs/workbench/services/files/electron-browser/remoteFileService.ts
+++ b/src/vs/workbench/services/files/electron-browser/remoteFileService.ts
@@ -45,6 +45,7 @@ function toIFileStat(provider: IFileSystemProvider, tuple: [URI, IStat], recurse
 		name: posix.basename(resource.path),
 		isDirectory: (stat.type & FileType.Directory) !== 0,
 		isSymbolicLink: (stat.type & FileType.SymbolicLink) !== 0,
+		isReadonly: !!(provider.capabilities & FileSystemProviderCapabilities.Readonly),
 		mtime: stat.mtime,
 		size: stat.size,
 		etag: stat.mtime.toString(29) + stat.size.toString(31),