I don't know what happened. A Read/Write file in EXCEL 2003 somehow became a
Read-Only file. Now, I can neither write to the file and save it, nor rename
the file.

I've tried to use the properties / preferences modes for recovering the
file, but an error message continues that I cannot save the updated file.

Is there a way to revert it back to a R/W file?

Thank you, in advance, for any help.