From Just Solve the File Format Problem
PalmDOC, or AportisDoc, is an e-book and text document format that was popular on Palm OS devices.
It is usually found in the form of a Palm OS Database (PDB) file. Even if the file extension is .prc, it is probably in PDB format, not PRC format.
See also MOBI, an extension of PalmDoc.
In PDB format, ASCII characters
TEXtREAd appear at offset 60.
- http://cd.textfiles.com/pdasoftware/PILOT ...
- E.g. CALORIES.PDB, CHI-FUN.PRC, JOKES.PDB