Is there a way to tweak Excel 2007, with an add-in perhaps, to enable it to save spreadsheets in the dbase IV file format?

Solution 1:

Seems to be various converters to/from dBase here: dbfView

I see options for Excel 2003, 2007, and CSV there.

Solution 2:

I doubt this. But you can export to, let's say, csv file, and then use converter to get your dBase file. I believe getting CSV (or other open format) to dBase converter is much easier than trying to convert directly to dBase from Excel.