Aug 30 2018 11:32 PM
I've personally never tried to do it, but a websearch has produced some good references.
See if this helps?
http://www.excelsupersite.com/how-to-remove-an-excel-spreadsheet-password-in-6-easy-steps/
Your other alternative is to have a think and trial and error likely passwords until you hit it.
Best of luck with your spreadsheet.
Cheers
Damien