Windows - Windows Media Maker VOB files problem

I have a problem reading a video file on the pc that was altered by my macbook.

I've got footage of my grandmother on a video file that was originally on my husband's pc. Before she died I had to transfer some of these files to my mac so that my husband had room on his hard drive to download something. Now that I have sent them back to his pc they cannot be read on his pc. They are showing up as a folder containing: source, jacket p and cache.

My husband said that it was in a 'video ts' file created using windows media maker if that helps.

How do I get them restored to how they were?

Deirdre