On Jul 1, 2016, at 09:18 , Matthew LeRoy <mle...@minitab.com> wrote:
> 
> steps to troubleshoot/rectify the issue?

Since it’s hard to find out what’s going on with UTIs, I suggest you start by 
making sure your assumptions are correct. I’d try getting rid of the app that 
has the imported UTI declaration (e.g. zip the app and delete the unzipped 
original), then verify that the extension for that imported UTI no longer 
works, AND make sure that the extension for the exported UTI in the other app 
really does work.

(There could be another app that exports the “wrong” UTI instead of importing 
it. Or the intended exporting app may be doing-it-wrong. Either of those could 
produce the symptoms you’re seeing.)

If the correct UTI works for the exporting app when it’s unconflicted, then I 
don’t see what you can do except submit a bug report. However, when both apps 
are present, the extension that Launch Services recognizes may depend on the 
order of app installation, or on the file system date of the app. One of those 
things could lead to a workaround, with a bit of experimentation.

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