mapping file extensions

genecutl

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Is there a way to custom map a file extension to a specific app? For example, if I want to open all .xyz files with my XYZ app. If I open the Get Info window, it lets me choose an application based on the Type/Creator (which in this case is ????/None), but not based on the file extension.

I couldn't find any mime.types-like files. The only files I know of that may be involved are the LS* files, but those are binary files and not trivial to edit.
 
the application tab in the inspector allows you to determine how to open an app based on extension.
 
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