Windows 7 Document file locked for editing by unknown user

Unable to use LibreOffice programs due to being locked

Unable to print

The program surely isn’t locked. Your workfile may be.
Your file being (say) MyFile.odt:
Look for a file .~lock.MyFile.odt# in the same folder. If there exists the respective LockFile it is a relic of an editing session not closed in the appropriate way due to a system accident. Delete it before opening MyFile.odt again.