[doc] added docs for AppUserModelID

docs/References/App.md

@@ -172,6 +172,21 @@ Unregisters a global keyboard shortcut.
 
 See [Shortcut](Shortcut.md) for more information.
 
+## App.getDefaultAppUserModelID() (Windows)
+
+* Returns `{String}` the default application wide AUMID.
+
+Get the default application wide AUMID (App User Model ID). See also [`app_user_model_id`](Manifest Format.md#app_user_model_id-windows) field in Manifest Format.
+
+## App.setDefaultAppUserModelID(app_id) (Windows)
+
+* `app_id` `{String}` the default application wide AUMID. 
+
+Overwrite the default application wide AUMID (App User Model ID) for newly opened windows. See also [`app_user_model_id`](Manifest Format.md#app_user_model_id-windows) field in Manifest Format.
+
+!!! warning "No Change for Previous Opened Windows"
+    This API will only affect the newly opened windows. It will **NOT** change the AUMID for previous opened windows. To change them, you need to iterate all windows and call [`win.setAppUserModelID(app_id)`](Window.md#winsetappusermodelid-app_id-windows) for each.
+
 ## Event: open(args)
 
 * `args` `{String}` the full command line of the program.

docs/References/Manifest Format.md

@@ -153,6 +153,16 @@ These certificates are used as additional root certificates for validation, to a
 
 * `{Boolean}` whether the default `Edit` menu should be disabled on Mac OS X. The default value is `false`. Only effective on Mac OS X.
 
+### app_user_model_id (Windows)
+
+* `{String}` Default application wide AUMID ([App User Model ID](https://msdn.microsoft.com/en-us/library/windows/desktop/dd378459(v=vs.85).aspx)). Only effective on Windows.
+
+This property is a fallback when [window specific AUMID](#app_user_model_id-windows_1) is not set.
+
+If this property is not set, NW.js will use a auto generated AUMID.
+
+This property can be overwritten by [`nw.App.setDefaultAppUserModelID(app_id)`](App.md##appsetdefaultappusermodelidapp_id-windows) at runtime.
+
 ## Window Subfields
 
 Most of window subfields are inherited by sub windows opened by `window.open()` or links (`<a target="_blank">`) by default. The exception list of non inherited subfields are as following. They will be set to default value for opened window:
@@ -259,6 +269,12 @@ Control the transparency with rgba background value in CSS. Use command line opt
 
 There is experimental support for "click-through" on the transparent region: add `--disable-gpu` option to the command line.
 
+### app_user_model_id (Windows)
+
+* `{String}` window specific AUMID ([App User Model ID](https://msdn.microsoft.com/en-us/library/windows/desktop/dd378459(v=vs.85).aspx)). Only effective on Windows.
+
+The AUMID of the window can be changed at runtime by [`win.setAppUserModelID(app_id)`](Window.md#winsetappusermodelidapp_id-windows).
+
 ## WebKit Subfields
 
 ### double_tap_to_zoom_enabled

docs/References/Window.md

@@ -61,6 +61,7 @@ nw.Window.open('https://github.com/nwjs/nw.js', {}, function(new_win) {
     - `new_instance` `{Boolean}` _Optional_ whether to open a new window in a separate render process.
     - `inject_js_start` `{String}` _Optional_ the script to be injected before document loaded. See [Manifest format](Manifest Format.md#inject_js_start)
     - `inject_js_end` `{String}` _Optional_ the script to be injected before document unloaded. See [Manifest format](Manifest Format.md#inject_js_end)
+    - `app_user_model_id` `{String}` _Optional_ the AUMID (App User Model ID) for the window. See [Manifest format](Manifest Format.md#app_user_model_id-windows)
     - `id` `{String}` _Optional_ the `id` used to identify the window. This will be used to remember the size and position of the window and restore that geometry when a window with the same id is later opened. [See also the Chrome App documentation](https://developer.chrome.com/apps/app_window#type-CreateWindowOptions)
 * `callback(win)` `{Function}` _Optional_ callback when with the opened native `Window` object
 
@@ -421,6 +422,16 @@ Execute a piece of JavaScript in the frame.
 
 Load and execute the compiled snapshot in the frame. See [Protect JavaScript Source Code with V8 Snapshot](../For Users/Advanced/Protect JavaScript Source Code.md).
 
+## win.setAppUserModelID(app_id) (Windows)
+
+* `app_id` `{String}` Set AUMID ([App User Model ID](https://msdn.microsoft.com/en-us/library/windows/desktop/dd378459(v=vs.85).aspx)) for the window. Only effective on Windows 7 or later.
+
+This method will overwrite the AUMID set in [`package.json`](Manifest Format.md#app_user_model_id-windows_1).
+
+## win.getAppUserModelID() (Windows)
+
+* Returns `{String}` of AUMID ([App User Model ID](https://msdn.microsoft.com/en-us/library/windows/desktop/dd378459(v=vs.85).aspx)) for the window. Only effective on Windows.
+
 ## Event: close
 
 The `close` event is a special event that will affect the result of the `Window.close()` function. If developer is listening to the `close` event of a window, the `Window.close()` emit the `close` event without closing the window.