File won't open after hiding rows

I had a spreadsheet that I hid all rows and columns not containing data (lines 100-on, and columns AZ-on). I also had accidently formatted one whole column with currency. So the file in Explorer is now almost 4 megs, and will not open, at all. I need to get this data back as it took me almost 3 hours to create it.

Please help.

Mike Kingsley