Topic on Talk:The big list of third-party DRM on Steam
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I know, I used 7-zip too.
What I wanted to point out was that.. I compared 1.01 and 1.01a patch (the latter probably fixed the issue with windows explorer crashing)
But.. the only different file was the game executable (masseffect.exe), which is everything but a shell extension
So there must be something that 7-zip can't see. And this surprised me