Attempting to open a file and returns the message File is in use by another user.
File was opened but not closed correctly or another user is in the file.
Note: when you open a file, a *.DAT file is created in the same location of the file and will remain present whilst you have the file open. When you exit the file, the *.DAT file is erased. While the *.DAT file is present no other user can open the file.
1. Browse to the location of the file.
2. You should see a DAT file which is named [your machine name]---[filename].DAT and if you are certain that no one is in the file then delete this file.