Thank you for your reply. I will try that.
Jean

On 22 oct. 2012, at 18:21, Mike Abdullah wrote:

> 
> On 22 Oct 2012, at 16:54, Sean McBride wrote:
> 
>> On Wed, 17 Oct 2012 13:38:45 +0200, Jean Suisse said:
>> 
>>> My scientific cocoa app (10.6-10.8) records acquired data from devices
>>> and store them in human-readable UTF8 text files that have specific
>>> extensions (different from .txt). I have two questions related to file
>>> extensions, default application, icons and preview in quick look to
>>> submit to your expertise.
>>> 
>>> The app that collects and stores the data is not the same as the one
>>> that is used to view the data (third-party text editor).
>>> I have found how to tell launch services to open the files with the
>>> third-party text editor, but I can't find how to associate the icon of
>>> my app with all the files extensions I use. How can I do that using
>>> cocoa or a shell script ? – this is my first question.
>>> 
>>> Secondly, how can I tell quick look to preview the-said files just like
>>> it would any other text file ?
>> 
>> Jean,
>> 
>> From the sounds of it, it might be best if you just use ".txt" for your 
>> human readable text files.  QuickLook will then generate previews, and the 
>> user's preferred text editor will open the file when double clicked.
> 
> I believe declaring your file format as conforming to public.plain-text will 
> automatically gain that ability too.


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