Fix “File In Use” Deletion Errors On Network Drives
 

Even though both Windows and its users have made the jump to the 21st century, there’s still some lingering 1990s-era annoyances hiding out in the OS including Windows’ tenacious desire to create thumbnail files (and then refusing to delete them). Read on as we solve the “File In Use” deletion error problem.

http://www.howtogeek.com/210764/fix-...il-generation/