Hello,

When I open a certain Excel file, I receive a message to the effect that

'The file <filename is locked because it is being edited by <myname. Press
Read Only or Notify.'

Now the file, which I created and use myself, has never been shared, and
every time I encounter this situation, I must use the 'Save As' command to
save any changes to the file.

How do I unlock the file? Suggestions are most welcome!