On Jan 22, 2014, at 8:33 AM, Remco Poelstra <re...@beryllium.net> wrote:

> I'm writing an app which has to import files without a fixed file extension. 
> There are about 10 different commonly used file extensions around.
> Is it possible to associate a file to my app based on the file contents? Much 
> like how file (1) determines a file's type?
> Or should I simply register all know file extensions?

Is this a standard type that just happens to have multiple filename extensions 
associated with it (like .jpg and .jpeg for JPEG files)? If so, there might be 
a UTI for that type, which you can just register for instead of registering for 
the filename extension directly.

If the type has no existing UTI (for example, if it's a type specific to your 
app), you can define your own UTI for it, and list the file extensions it uses 
in the UTI definition.

Charles

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