Cannot get trimmed a DV-AVI movie in MS Movie Maker

It turns out that my MS Windows Movie Maker (further - MM) saves an untrimmed clip (Save Movie menu) in DV-AVI format.

The long story as as follows.
* A ripped DVD (a vob) was converted to a DV-AVI file (on a Mac, not sure which program, should not be relevant).
* It can be loaded into MM.
* It can be resaved again as a DV-AVI by MM
* It can be split in two or more clips, and the tail clip can be saved as a DV-AVI properly.
But the head clip of a split or trimmed/resized clip cannot be saved as intended in the DV-AVI format.
It saves, but so that only the sound track is trimmed, but the video goes all the way to the end of the original 'long' video.
It can be saved into other offered formats by MM, and that would be properly trimmed.
But the DV-AVI does not get trimmed!

Is there any workaround?

PLease help!