diff --git a/src/vs/vscode.d.ts b/src/vs/vscode.d.ts
index 8c69773e1f4..68d3bc42576 100644
--- a/src/vs/vscode.d.ts
+++ b/src/vs/vscode.d.ts
@@ -4854,17 +4854,14 @@ declare module 'vscode' {
 		 * to a file.
 		 */
 		type: FileType;
-
 		/**
-		 * The creation timestamp in milliseconds.
+		 * The creation timestamp in milliseconds elapsed since January 1, 1970 00:00:00 UTC.
 		 */
 		ctime: number;
-
 		/**
-		 * The modification timestamp in milliseconds.
+		 * The modification timestamp in milliseconds elapsed since January 1, 1970 00:00:00 UTC.
 		 */
 		mtime: number;
-
 		/**
 		 * The size in bytes.
 		 */
@@ -4904,6 +4901,12 @@ declare module 'vscode' {
 		 */
 		static FileIsADirectory(messageOrUri?: string | Uri): FileSystemError;
 
+		/**
+		 * Create an error to signal that an operation lacks required permissions.
+		 * @param messageOrUri Message or uri.
+		 */
+		static NoPermissions(messageOrUri?: string | Uri): FileSystemError;
+
 		/**
 		 * Creates a new filesystem error.
 		 *
@@ -5043,6 +5046,7 @@ declare module 'vscode' {
 		 * @param options Defines if existing files should be overwriten.
 		 * @returns Metadata about the renamed file or a thenable that resolves to such.
 		 * @throws [`FileNotFound`](#FileSystemError.FileNotFound) when `oldUri` doesn't exist.
+		 * @throws [`FileNotFound`](#FileSystemError.FileNotFound) when parent of `newUri` doesn't exist
 		 * @throws [`FileExists`](#FileSystemError.FileExists) when `newUri` exists and when the `overwrite` option is not `true`.
 		 */
 		rename(oldUri: Uri, newUri: Uri, options: { overwrite: boolean }): FileStat | Thenable<FileStat>;
@@ -5055,8 +5059,9 @@ declare module 'vscode' {
 		 * @param destination The destination location.
 		 * @param options Defines if existing files should be overwriten.
 		 * @returns Metadata about the copied file or a thenable that resolves to such.
-		 * @throws [`FileNotFound`](FileSystemError.FileNotFound) when `source` doesn't exist
-		 * @throws [`FileExists`](FileSystemError.FileExists) when `destination` exists and when the `overwrite` option is not `true`.
+		 * @throws [`FileNotFound`](#FileSystemError.FileNotFound) when `source` doesn't exist
+		 * @throws [`FileNotFound`](#FileSystemError.FileNotFound) when parent of `destination` doesn't exist
+		 * @throws [`FileExists`](#FileSystemError.FileExists) when `destination` exists and when the `overwrite` option is not `true`.
 		 */
 		copy?(source: Uri, destination: Uri, options: { overwrite: boolean }): FileStat | Thenable<FileStat>;
 	}
diff --git a/src/vs/workbench/api/node/extHostTypes.ts b/src/vs/workbench/api/node/extHostTypes.ts
index b1cb67d05c0..1d84be94566 100644
--- a/src/vs/workbench/api/node/extHostTypes.ts
+++ b/src/vs/workbench/api/node/extHostTypes.ts
@@ -1878,6 +1878,9 @@ export class FileSystemError extends Error {
 	static FileIsADirectory(messageOrUri?: string | URI): FileSystemError {
 		return new FileSystemError(messageOrUri, 'EntryIsADirectory', FileSystemError.FileIsADirectory);
 	}
+	static NoPermissions(messageOrUri?: string | URI): FileSystemError {
+		return new FileSystemError(messageOrUri, 'NoPermissions', FileSystemError.NoPermissions);
+	}
 
 	constructor(uriOrMessage?: string | URI, code?: string, terminator?: Function) {
 		super(URI.isUri(uriOrMessage) ? uriOrMessage.toString(true) : uriOrMessage);
diff --git a/src/vs/workbench/services/files/electron-browser/remoteFileService.ts b/src/vs/workbench/services/files/electron-browser/remoteFileService.ts
index 50accd1da5d..34a7b3d7609 100644
--- a/src/vs/workbench/services/files/electron-browser/remoteFileService.ts
+++ b/src/vs/workbench/services/files/electron-browser/remoteFileService.ts
@@ -240,7 +240,12 @@ export class RemoteFileService extends FileService {
 			case 'EntryIsADirectory':
 				res = FileOperationResult.FILE_IS_DIRECTORY;
 				break;
+			case 'NoPermissions':
+				res = FileOperationResult.FILE_PERMISSION_DENIED;
+				break;
 			case 'EntryExists':
+				res = FileOperationResult.FILE_MOVE_CONFLICT;
+				break;
 			case 'EntryNotADirectory':
 			default:
 				// todo