Ok that sorta makes more sense (though I wonder why you want to mix EQ outside of your MultiTrack app).

From what I read you should be able to use Winamp::Control to poll WinAmp's EQ and write that out any way you want. That sounds a lot easier than reverse engineering WinAmp's file format (well unless it's XML or other easily parsed format, but you still haven't told us what the EQF file looks like).

Though I still wonder why you wouldn't do it in your multi-track recorder, IIRC all the ones (Cakewalk, SLab) I have used (although it's been several years) you could gang(?) the channels together to stereo output and adjust EQ from there.