WARNING! THIS POST IS MORE THAN 180 DAYS OLD!
While I make an effort to update older posts to keep them relevant and technically accurate, the rapidly changing nature of the tech world makes it possible that the content of this post may no longer be relevant, current, or even accurate. Additionally, because of this post's age, adding new comments has been disabled. If you would like to contribute new information to this post, or have questions pertaining to this post, please use the Contact Form.
IsUsedBy is a software tool which you can use to determine what process on your system has a particular file open. This is important, for example, if you want to copy or delete a file and you don’t know why it isn’t working.
Download here: mstisusedby20e.exe