Associate a file extension (without a unique mimetype) with an application?

Applications
1

Hello

I am using an application called Hydrogen 2, which saves it’s projects in an XML file with the extension .h2song. When I click on an .h2song file in Nautilus, I would like it to open in Hydrogen 2. The problem is when I set it as the default app for that, it will open all XML files, which is undesirable.

Any way to fix this?

2

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