A MAC should be able to read a FAT32-formatted flash drive. When you plug it in, what error message do you receive?
A bigger issue is that Money will not run on OS X. You need to purchase a copy of Windows, install Mac's Boot Camp, install Windows, and install Money. Here's a link to information about Boot camp:
http://support.apple.com/kb/ht1461
If you need more detail, I suggest that you post to an Apple support forum.
Bill Becker