Yes, you will need to make a normal install before, with original setup.exe or you boot from the DVD / ISO.
This usually results in a system drive C:.
This installation sysprep, generalize and capture. The new WIM can be used with WinNTSetup and will always have C: as letter.
OK, will try that. Thank you very much for replying!
I must admit I can't "get my head around" how this is supposed to to work, but I will test it as soon as I get home. What I mean is this: I can't understand (without actually trying it) how a normal setup would use C:, while WinNTSetup would create D: as system drive. But of course, you will be right and I'm looking forward to "playing around" with that.
The update, sysprep/generalize and capture steps I always do anyway to create an updated wim, so that would stay the same.
And than again, I can't yet understand how a new install of the new wim would then ("suddenly") **DO** work correctly with WinNTSetup (and why this time the drive letter would be C:).
So I'll try the whole shabang, hope I won't have to bother you with my stupidity too much :-)