This is on a cleanly built machine, XP professional sp3.
I can't open a spreadsheet on a particular computer, even though I could before rebuilding the machine.
Now - I know that XLSM is a spreadsheet containing macros based on MS's new Open xml format, for 2007, but this was working before hand, so am I missing some converter program?

I can't open a spreadsheet on a particular computer, even though I could before rebuilding the machine.

Now - I know that XLSM is a spreadsheet containing macros based on MS's new Open xml format, for 2007, but this was working before hand, so am I missing some converter program?