Launcher.LaunchUriAsync(Uri, LauncherOptions) | launchUriAsync(Uri, LauncherOptions) method

Applies to Windows and Windows Phone

Starts the default app associated with the URI scheme name for the specified URI, using the specified options.


Windows.System.Launcher.launchUriAsync(uri, options).done( /* Your success and error handlers */ );



Type: Windows.Foundation.Uri [JavaScript] | System.Uri [.NET] | Windows::Foundation::Uri [C++]

The URI.


Type: LauncherOptions

The launch options for the app.

Return value

Type: IAsyncOperation<Boolean>

The launch operation.


The calling app must be visible to the user when the API is invoked.

You must specify the privateNetworkClientServer capability in the manifest in order to launch intranet URIs, for example a file:/// URI pointing to a network location.

You cannot use this method to launch a URI in the local zone. For example, apps cannot use the file:/// protocol to access files on the local computer. Instead, you must use the Storage APIs to access files.

When the launch fails for any of the above reasons, the API will succeed and return FALSE from its asynchronous operation.

To enable the user to choose an app instead of launching the default app, set the LauncherOptions.DisplayApplicationPicker | displayApplicationPicker property.

To display a warning that the URI is potentially unsafe, set the LauncherOptions.TreatAsUntrusted | treatAsUntrusted property.

The URI is passed to the associated app. If the associated app is a desktop app, the URI is passed using shell execution mechanisms.


This sample uses LaunchUriAsync(Uri, LauncherOptions) | launchUriAsync(Uri, LauncherOptions) to launch a URI with a warning. The TreatAsUntrusted | treatAsUntrusted property indicates that the system should display a warning.


For Windows Store apps using JavaScript, call preventDefault in your event handler if the treatAsUntrusted property is set and you are using an a element to launch the URI.

// The URI to launch
var uriToLaunch = "";

// Create a Uri object from a URI string 
var uri = new Windows.Foundation.Uri(uriToLaunch);

// Launch the URI with a warning prompt
var options = new Windows.System.LauncherOptions();
options.treatAsUntrusted = true;

Windows.System.Launcher.launchUriAsync(uri, options).then(
   function (success) {
      if (success) {
         // URI launched
      } else {
         // URI launch failed


Minimum supported client

Windows 8

Minimum supported server

Windows Server 2012

Minimum supported phone

Windows Phone 8.1 [Windows Phone Silverlight 8.1 and Windows Runtime apps]


Windows::System [C++]



See also

Association launching sample
Guidelines and checklist for file types and URIs
How to launch the default app for a URI (JavaScript)
How to launch the default app for a URI (C#/VB/C++)



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