I found this. Didn't read too deep tho'.

https://www.chainsawonatireswing.com/2012/09/19/changing-default-applications-on-a-mac-using-the-command-line-then-a-shell-script/#find-out-the-current-default-for-an-extension

Bob S


> On Aug 6, 2019, at 13:36 , Paul Dupuis via use-livecode 
> <use-livecode@lists.runrev.com> wrote:
> 
> So we make an OSX desktop app in LiveCode that has several document types. We 
> add these to the info.plist file in the App bundle so they are defined, with 
> doc icons, extensions, types, etc.
> 
> If a user has APPv1 installed that has a plist entry for the file extension 
> .myext and then installs APPv2 that also has a plist entry for file extension 
> .myext. how does OSX tell what APP to open when a user double clicks on 
> document.myext?
> 
> 
> I googled and found information on setting default app for document types, 
> but not how OSX handles this by default?
> 
> In window, it is the App's responsibility to check the Registry for its 
> document types and, it it wants to, ask the user if they want those document 
> associated with it. Or it is done by the app's installer on Windows
> 
> I just can't find how OSX does it.


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