I have a Nikon digital camera and Windows 7 will not play back video from it. I get an error message which reads.
Windows Media Player cannot play the file. The Player might not support the file type or might not support the codec that was used to compress the file.
It used to work fine when I had Vista.
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More aboutwindows video player problems
Try installing ffdshow tryout from here http://ffdshow-tryout.sourceforge.net/ and try playing the video files with mpc-hc from here http://mpc-hc.sourceforge.net/downloads/ with those two installed correctly you should have no problems with playing any video file you will need.
Don't ffdshow. Pointless codec pack. Just use VLC.