>Does anyone know what would have been used to create DAT data files in a DOS database language? If so, is there a converter to make it into something FoxPro can understand? Thanks.

DAT doesn't seem to refer to any single type of file format. It usually just means "data".

Check out this link http://www.wotsit.org/cgi-bin/search.cgi?dat
for information on some type of dat files.

P.S. For anyone lurking on this thread, I found a cool site called http://www.fileformat.com You can upload a file and it will convert it to another format. Very interesting.