I tried a way to create my own file type and associate the file icon. I hope it helps.
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It’s terribly messy, I’m sure it could have been better, but apparently you were just trying to show how it works. It’s practically not a Godot project, but it can be useful.
@sohailmalik123 Interesting, thanks for sharing - one question though - why would anyone do this ? I don’t get it.