Steve D'Aprano wrote:
They are still supported (-ish) by OS X, but have been superseded by Uniform
Type Identifiers.
https://en.wikipedia.org/wiki/Uniform_Type_Identifier
I know, what I'm not sure about is how much those are used
by apps these days, with so much of the widely used software
being multi-platform.
The Finder doesn't make it easy to tell -- it just shows
you which app is the default one for a file, without any
details as to how it's determining that.
And if you change the default app for a file, it asks
"Do you want to open all file like this with <whatever>?",
but it's not very clear what "like" means for a given file.
It could mean "having the same suffix", "having the same
UTI", or "having the same legacy type code".
--
Greg
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