Yo !
Thank you GoG, for releasing Megarace. It's been a while since I played it, due to problem with DosBos and the "insert CD 2" thing...
Now, here's the question. I assume that all the cinematics are in the file MEGARACE2.gog.
Is it possible to replace the english cinematics of that file by the french cinematics I have on my original CDs ?
Cause I love the french dub of Lance Boyle :)

I THINK everything boils down to what exactly is the CD image's format. I would assume that since there's no copy-protection DRM scheme going on (due to M2 being released way before that nonsense was actually a valid issue) you could make a CD image containing data from both (french) CDs and use that.
Fake edit: I just checked out M2's autoexec - turns out the .gog file is actually just an ISO image. So, you could try that: get all the files from both CDs, make an ISO containing them all, call it MEGARACE2.gog (keeping the original as backup, obviously) and see if this works ;)

yep, it works :)

Simply copy all files to the games directory and play without a CD thingie in easier way :)