When a user has the preview pane turned on in Windows Explorer, they cannot rename or move files. This is because, unlike the thumbnails generated for photos, the OS does not release the current file after opening it and generating the image. The OS then falsely reports that the file is locked by someone for editing. The worst instance of this came when a user made the panel large enough to fill the screen with a life size preview of an Excel file. They then attempted to edit the image as though they were working in Excel. Beware the Preview Pain.