I don't have time to test these suggestions, but in the past I've used a couple techniques, so these would be worth trying:
For lots of tables... use Mif2Go (omsys.com) to automatically convert the FM source to clean, formatted .rtf. Open the .rtf in Word, define the table, copy, and paste into Excel.
(I don't know what would happen if you opened the .rtf directly in Excel... I don't know how it would deal with regular text.)
For just a few tables, I think you could live without Mif2Go and use FM's save as .rtf function, although it doesn't generate as clean a file.
You're probably still going to have to do some hand formatting in Excel, I suspect.