When you begin to view the video, the cache file will store information about only the portion of the video you watched because the video is still downloading. WMP's cache file also can cause problems when you attempt to view a video clip before you've finished downloading the video from the Internet. Related: Troubleshooting Windows Media Player errors
Although this cache file is never transmitted and isn't in an easily readable format, another user accessing your system could review the file to determine what media you've been watching or listening to. When you play any media file on your computer, WMP uses a cache to track what video and music files you've accessed.
