Steam Community :: Guide :: Adding a Non-Steam Game to Your Library

I will give you instructions on how to add an application or game to your Steam library that was not purchased or activated through Steam.

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Steam Community :: Guide :: How To Add Windows 10 Xbox App To Steam Library

Steam says that this game is running but I can't see it, it is also not popping up in the task manager, does anyone have a solution to this? : r/ Steam

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Steam Community :: Guide :: Adding a Non-Steam Game to Your Library

How to See Hidden Games on Steam

How to add non-Steam games to your Steam library