quality will be Ok as these are .wmv files.

about taking screnshots:
It is the easiest way to take screenshot with Media Player Classic, it comes with K-Lite codec pack or you can download it from the net for free ofcourse! Just play the video file with Media Player Classic and click to pause when you choose a fram/scene. Then just go to File menu and choose "Save image as". Thats it!!!!

Done!!!! Good Luck!