How does OSX tell what app to open when you double click a file?

[Bob Sneidar]

If you are simply trying to open an file with a specific app that may or may not be the default, what I use is launch document using the with argument. In my Forms Generator app this becomes necessary, because some PDF viewers may not be able to edit forms. So I have an interface where the user selects which app they want to open fillable forms with, so I can force the issue when the time comes. 

Bob S
 

> On Aug 6, 2019, at 13:57 , Bob Sneidar via use-livecode <use-livecode at lists.runrev.com> wrote:
> 
> 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 at 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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