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An MHT file is a web page and a WMV file is a video extension. You can convert an MHT file to a WMV file using Xilisoft Video Converter Ultimate.
You will need a WMV DRM remover software that plays the WMV file and re-records it in another format.
You can refer to this tutorial, it's about how to convert video including MP4 to WMV, it works pretty well for me.
The way to turn a Windows Movie Maker file into a wmv, is to Publish or Finish the moviein the program first.
Once that is done, the video is exported (converted) into a wmv file.
There is a software call DVD to WMV Ripper. You can use to rip DVD formats to .wmv formats.