I recently installed a new Server 2012 R2 Standard and it acts as a file server only. It is not a domain controller and doesn't host any apps. In Computer Management > Open Files, files will remain "open" in this window even after the client closes the file. The "open" file will eventually disappear, and the delay can range from minutes to several hours. Also, the attached screenshot displays many network shares that have been accessed by clients, and these also linger as "open". These aren't even open files.....they are just directory paths. Why are these items appearing?