Generals

[Pneumatus]

I am trying to intergrate a no-cd patch into my Generals CD. I have game.dat and generals.exe that work when they are used to replace the installed files. They are both located in Data1.cab on CD1 so i have tried to insert the new files. The cab files appear to be standard MS Cab files but despite many packs/unpacks, the installer seems to detect that the files are different.

Can someone offer me an indication on why what i'm trying to do isn't working and why/how generals is unable to read the files even though they can be unpacked successfully.