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I just got the software and I was wondering if it works on blacklight retribution on steam? or just for steam in general I guess and how I do it.

Have you read the documentation on how to use PlayOnLinux?

http://www.playonmac.com/en/documentation.html

I dont see that game in the software list, so no one has written a script for it. Read the documentation, and try to do a manual install of the game, and we will see what happens. Then, if it doesnt work, we can look at the debug output and determine what the problem is with it.