Custom file extension support

[obp3ter]

Is your feature request related to a problem?

I would like to have the option to define some file formats, that are aliases for the already supported ones.

Describe the solution you'd like

The best solution would be a settings menu, where for the already existing formats I could add additional formats in a text field to be treated the same.

Additional context

No response

[AntonShuvaev]

Thanks for the suggestion. I will implement it in the next version.