On Oct 5, 2009, at 9:02 PM, James Walker wrote:

FWIW, in the classic Mac OS, it was not uncommon to see a PDF with NO extension, but with the file type set to 'PDF '.

Yes. Fortunately, if you have your application check the UTI instead of the filename extension, you'll always detect that it's com.adobe.pdf whether the identifying information is in the extension, HFS type code, or anything else the OS may use in the future to determine the type.

Charles
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