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 :: Contributing Screenshots, Artwork and Videos to the Steam Community

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All-in-One: How to Add Non-Steam Games to Your Steam Library

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How to add external games to your Steam library

A Handy Guide to Graphical Assets on your Steam Store Page

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How to Add Non-Steam Games to Steam and Apply Custom Icons

How to Add Non Steam Games to Steam Library [Easy Guide]