use win32MutexName

fixes #972

src/vs/workbench/electron-main/env.ts

@@ -31,6 +31,7 @@ export interface IProductConfiguration {
 		}
 	};
 	win32AppUserModelId: string;
+	win32MutexName: string;
 	dataFolderName: string;
 	downloadUrl: string;
 	updateUrl: string;

src/vs/workbench/electron-main/main.ts

@@ -90,7 +90,7 @@ function main(ipcServer: Server, userEnv: env.IProcessEnvironment): void {
 	let windowsMutex: Mutex = null;
 	try {
 		const Mutex = (<any>require.__$__nodeRequire('windows-mutex')).Mutex;
-		windowsMutex = new Mutex('vscode');
+		windowsMutex = new Mutex(env.product.win32MutexName);
 	} catch (e) {
 		// noop
 	}