As VOB is plain MPEG2 you only need to encode that in what MS Moviemaker wants. I can't guess since that changed over the years but you can decode what that is.
Use "Media Info" to see what MS Moviemaker wants then use a video convertor. No ripping required.
I have an older DVD writer that I'm using to convert old family VHS tapes to digital format.
The DVD burner produces files in VOB format, which I am unable to edit in MS Moviemaker.
I know this question comes up from time to time, but the answer changes, as software, formats, laws change...
What will be the best shareware or freeware out there for my project - converting .VOB files to a format that I can manipulate and edit in MS Moviemaker?