There was some marriage function DVD which I want to edit in Window Movie maker. But starge thing is that Movie maker windows 8 does not support .vob file extension😦
So here is the solution.
I converted the .vob to .mpeg using YTD (http://youtubedownloader.com/) There are several other few video file convertor available on line.
Once file was converted to meg Window movie maker accepted it gracefully🙂