Re: Overlapping Extensions and UTIs in NSDocument

FROM : Sean McBride
DATE : Thu May 29 16:55:15 2008

On 5/29/08 3:20 PM, Markus Müller said:

>Could it be that it's not allowed to have UTIs with overlapping extensions?


Bingo.  LaunchServices does a 1-to-1 mapping between a file and a UTI.
That is, a file can have only 1 UTI.  So if two UTI declarations claim
the same extension you are screwed.  See the quicklook-dev archives for
more info.  A workaround I tried was to use an HFS file type, but alas
the system gives priority to extensions even in the case of conflict.
So if you have 2 UTIs:

1)  UTI: com.UTI1
  type: 'TEXT'
    ext: .mm

2)  UTI: com.UTI2
  type: 'FOO '
    ext: .mm

and ask LS for the UTI of a file that has extension .mm and type 'FOO '
LS might return 'com.UTI1'.

And please file a bug.  Mine come back 'behaves as expected' so I think
Apple needs convincing.

--
____________________________________________________________
Sean McBride, B. Eng                <email_removed>
Rogue Research                        www.rogue-research.com
Mac Software Developer              Montréal, Québec, Canada