Files with a .pdb extension can contain several different file types - for ebook files they are normally either Palmdoc format (an older unprotected text format from the PalmOS days that both the desktop and iPhone versions of Stanza can read) or the more modern and flexible eReader format (ereader format files can be protected with eReader's DRM or unprotected, they're essentially an extension of Palmdoc format), which only Stanza for the iPhone can currently read, hence the message when you try to open an eReader file with desktop Stanza. The generic .pdb extension was used by PalmOS as a general catch all for any sort of data file the exact format of which was application dependent. Unfortunately this means that a file having a .pdb extension tells you very little about what type of data it actually contains - it could be PalmDoc text , ereader text (either with or without DRM) or an old PalmOS address book database, spreadsheet, or something else entirely.

As noted previously you get the same message if you try to open other files such as MobiPocket with DRM that Stanza desktop cannot read.

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