I hope this is not off topic. This thread has been very helpful. Thank you
But if anyone is just looking to make Cab's with register edits only,
CeReg Editor 0.0.5.2 will make cab files very easily.
1. Make or locate the register edits you want to make into a cab file. Highlight it.
2. Click on Edit. Then go to Export as and save the edit.
3. Click on Conversion. Then Reg-> Cab Select the edit you just saved. It will ask you to name the cab
4. You are done. Your new Cab file is in the same directory as the exported file.
This is much easier than WinCe and its free...