Well, finally got the .mp4's working on my notebook But... when I check the Filters option in MPC the "Elecard MP4 Demultiplexer isn't listed???" It is listed in de DirectShow Filter Manager tho. Oh well, at least this is keeping me off the streets Edit: Hmmm.... After installing FFDShow (with just DivX/XviD checked in the install), QT Alt and Real Alt, I'm able to SEE the .MP4 files, just no sound yet... When I check in MPC which filter is being used, it's "ffdshow MPEG-4 Video Decoder" (FFV1?) Now I'll install your DSFP 1.9 pack and configure FFDShow and see what happens...