ARMAX has fixed "my" memory problem and updated DFC to use Dot.Net 4.8 standard. This little tool can create Full/diff-Dats for MAME/HBMAME (only).
https://www.mameguide.info/dfc.html
Direct link until I have updated the webpage https://www.mameguide.info/file/DataFileCreator_v7.1.1.1.7z