Depending on the video format of the video clip, Media Center may not be able to fast-forward and rewind through that clip.

If you are trying to navigate through a video clip that does not support these features, the skip-forward and skip-back features may still function normally. The ability to fast-forward and rewind is dependent on the video format of the video clip, not the file format of the clip. You may not be able to determine the video format based on the file extension of the video file.