Video thumbnails

  leadwellie 09:43 07 Jul 2010

I have a number of videos on an external drive, all of them legal I must add. My query is this up until yesterday all of the video files showed a picture of part of the video (hope this makes sense. Now all of the video files only show the file ie AVI WMV etc. Can anyone explain what may have happened and how I might get back the picture thumbnails.
Thank you in advance.

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