Add Open with Atom file context menu

src/browser/squirrel-update.coffee

@@ -28,11 +28,40 @@ exports.spawn = (args, callback) ->
 exports.existsSync = ->
   fs.existsSync(updateDotExe)
 
+installContextMenu = (callback) ->
+  fileKeyPath = 'HKCU\\Software\\Classes\\*\\shell\\Atom'
+
+  spawnReg = (args) ->
+    regProcess = ChildProcess.spawn('reg.exe', args)
+
+    error = null
+    regProcess.on 'error', (processError) -> error ?= processError
+    regProcess.on 'close', (code, signal) ->
+      error ?= new Error("Command failed: #{signal}") if code isnt 0
+      error?.code ?= code
+      callback(error)
+
+  installFileMenu = ->
+    args = [fileKeyPath, '/ve', '/d', 'Open with Atom']
+    spawnReg args, (error) ->
+      return callback(error) if error?
+
+      args = [fileKeyPath, '/v', 'Icon', '/d', process.execPath]
+      spawnReg args, (error) ->
+        return callback(error) if error?
+
+        args = ["#{fileKeyPath}\\command", '/ve', '/d', process.execPath]
+        spawnReg(args, callback)
+
+  installFileMenu(callback)
+
 # Handle squirrel events denoted by --squirrel-* command line arguments.
 exports.handleStartupEvent = ->
   switch process.argv[1]
     when '--squirrel-install', '--squirrel-updated'
-      exports.spawn ['--createShortcut', exeName], -> app.quit()
+      exports.spawn ['--createShortcut', exeName], ->
+        installContextMenu ->
+          app.quit()
       true
     when '--squirrel-uninstall'
       exports.spawn ['--removeShortcut', exeName], -> app.quit()