You show NU.exe 4.5 is not running (probably because of accessing Track 0 of the disk). My example is fi.exe of NU 4.0 which runs excellent under real XP und has under virtual XP exactly the same bug I reported here. I can pass fi.exe to you (16 KB) if you tell me how.
The microsoft list of deprecated interrupts does not contain INT 21h, AH=4E and 4F, which has the problem.
I'm not shure what are you telling me. Can the bug be fixed?
Thanks a lot