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Quoth · 10-31-2025, 05:05 PM

No, .pdb is a generic PalmOS ending that originally meant Pilot Database.
There are at least two different .pdb formats that Calibre supports for ebooks.
One is the PalmDOC eBook format which is a special version of the PDB format

The last mobipocket for PalmOS reads both. Other programs read only one.
There are likely many other programs on PalmOS that use files with a .pdb ending.

See https://hwiegman.home.xs4all.nl/file.../P/pdb/pdb.htm
and https://en.wikipedia.org/wiki/PDB_(Palm_OS)
The .prc is also a kind of database file, the Palm Resource Code, see https://en.wikipedia.org/wiki/PRC_(Palm_OS)

There are also MS .pdb = Program Database on Windows NT and Protein data files that have nothing to do with Palm OS.

Palm started on 6800 and moved to ARM.

10-31-2025, 05:05 PM	#2
Quoth Still reading Posts: 15,344 Karma: 113121807 Join Date: Jun 2017 Location: Ireland Device: All 4 Kinds: epub eink, Kindle, android eink, NxtPaper	No, .pdb is a generic PalmOS ending that originally meant Pilot Database. There are at least two different .pdb formats that Calibre supports for ebooks. One is the PalmDOC eBook format which is a special version of the PDB format The last mobipocket for PalmOS reads both. Other programs read only one. There are likely many other programs on PalmOS that use files with a .pdb ending. See https://hwiegman.home.xs4all.nl/file.../P/pdb/pdb.htm and https://en.wikipedia.org/wiki/PDB_(Palm_OS) The .prc is also a kind of database file, the Palm Resource Code, see https://en.wikipedia.org/wiki/PRC_(Palm_OS) There are also MS .pdb = Program Database on Windows NT and Protein data files that have nothing to do with Palm OS. Palm started on 6800 and moved to ARM.