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I thought I tried it earlier and it wasn't working, and that you needed something like zoom player to use ffdshow. I fired up windows media player today to check some home movies, and poof, ffdshow kicked in.
Yea, I use Theatertek, and after I set up Theatertek to use FFdshow, anytime I play something with WMP, FFDshow is working on it. I don't know, maybe it auomatically uses filters you have installed on your sustem...