Seems that the Mac's Type/Creator data trumps the file's extension.
If the file's fresh off the boat from Windowsland and hasn't been saved from
Mac
PPT, then it has no Type/Creator data and Mac PPT follows the extension just
as
it does on the PC.
Correct to both. This is how OS X works: it honors extensions, like the good
Unix OS it is. All the new Apple programs (TextEdit, Pages, Keynote, etc.)
make documents with extensions and but no file type or creator type. But it
also has to honor file type and creator type made by traditional Mac apps
(generally Carbon apps like PPT that existed back in Classic days too). And,
when in doubt, the file type and creator type takes precedence over
extension and "bundle signature" or "identifier" (probably because people
can make incorrect extensions, or remove extensions, but it's a lot harder
and less common to "fake" a file type - you need special tools and
knowledge). So it looks for a file type, and only if it finds none looks for
the extension.
--
Paul Berkowitz
MVP MacOffice
Entourage FAQ Page: <
http://www.entourage.mvps.org/faq/index.html>
AppleScripts for Entourage: <
http://macscripter.net/scriptbuilders/>
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