SolidWorks locks files with no file open

I was wondering if I can fix this behavior. When I'm done with a project I like to drag it into an archive directory, sort of like a pre recycle bin. Released drawings go elsewhere.

One thing I've noticed is that when I'm done with a file and close it in solidworks I can't move the file until I've completely closed solidworks. I can't move files even though Solidworks is a blank window with no file open. This gets to be annoying sometimes especially if I have files from other projects already open.

SolidworksGeneral