5 Ways To Delete A File In Use In Windows: "Windows Explorer thinks the file you’re trying to delete is still open, but it’s not? This commonly happens with video files that were played back in Windows Media Player but it can happen with any other file, too. The file is either running in the background or it wasn’t closed properly. You can even run into this issue with files you haven’t opened in years! Fortunately, this can be resolved in a few different ways."
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