Legacy Documentation: Version 2018.2 (Go to current version)
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public static void LaunchFile(WSA.Folder folder, string relativeFilePath, bool showWarning);


folderFolder type where the file is located.
relativeFilePathRelative file path inside the specified folder.
showWarningShows user a warning that application will be switched.


Launches the default app associated with specified file.

Note: if the application associated with file is the same as the one performing the launch, Windows won't open a new application, instead it will simply invoke OnActivated event in App.xaml.[cs/cpp] file.

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