CTX - Creativyst Table eXchange Format - A low-overhead alternative for exchanging tabular data. Overview, philosophy and goals, structure conventions and examples. - http://www.creativyst.com/Doc/Std/ctx/ctx.htm
Xbase File Format Description - Describes various Xbase file formats, including the data files and the index files. By Erik Bachmann. - http://www.clicketyclick.dk/databases/xbase/format/
The Comma Separated Value (CSV) File Format - Used first in MS Excel, CSV has become a pseudo standard export throughout the industry. Overview, description, examples. CSV and Unicode. CSV to XML converter. - http://www.creativyst.com/Doc/Articles/CSV/CSV01.htm