OEB documents are often held in a zip bundle, and FBReader recognizes the extension .oebzip for this kind of document. Several of these file formats typically have the extension .pdb (Plucker, Palmdoc, zTxt), but so do many other kinds of files - including some e-book formats. This sometimes causes confusion, but it may be better to map .pdb to FBReader than to nothing. Or explicitly check bytes 61-68 for the strings: "DataPlkr", "TEXtREAd" (Aportis Doc), or "zTXTGPlm".
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