On Windows "Cancel" button is also forced to be canclId

atom/browser/api/lib/dialog.coffee

@@ -101,12 +101,6 @@ module.exports =
           options.cancelId = i
           break
 
-    # On OS X the "Cancel" is always get selected when dialog is cancelled.
-    if process.platform is 'darwin'
-      for text, i in options.buttons when text is 'Cancel'
-        options.cancelId = i
-        break
-
     binding.showMessageBox messageBoxType,
                            options.buttons,
                            options.cancelId,

docs/api/dialog.md

@@ -79,8 +79,8 @@ will be passed via `callback(filename)`
   * `cancelId` Integer - The value will be returned when user cancels the dialog
     instead of clicking the buttons of the dialog. By default it is the index
     of the buttons that have "cancel" or "no" as label, or 0 if there is no such
-    buttons. On OS X the index of "Cancel" button will always be used as
-    `cancelId`, not matter whether it is already specified.
+    buttons. On OS X and Windows the index of "Cancel" button will always be
+    used as `cancelId`, not matter whether it is already specified.
 * `callback` Function
 
 Shows a message box, it will block until the message box is closed. It returns