Checking for external application preferences

Unity Engine
1

Whenever I double-click on an .fbx file it says: Unable to open. Check external application preferences. I want to set it to 3ds Max so whenever I click on it, it will automatically open that application.

Does anyone know how to set it?

Thanks in advance

Matt.

2

fbx requires an import into Max. They can’t be opened by Max.
I believe only .max files can be set to automatically open in Max.