.kju
It seems like it was limited to bohemia stuff. Like launching 'Arma 3 Community Guide Series: Zeus DLC'.
Description
Opens a Steam application, returns false if it was not possible to run the application.
Syntax
openSteamApp appID
Parameters:
appID: Number
Returns: Boolean
Examples
Example 1
openSteamApp 553228;
See also
getSteamFriendsServers · openYoutubeVideo