Custom extension (not .j3o) for saving game

Hello monkeys,
I’ve worked on my application for some months and I have finally started working on the save/load functions.
The software is an editor and I’d really need to save the data with a custom extension like: myProject.exn .

The official tutorial says I can only do this: myProject.j3o.
My only other idea is creating manually the save/load library but I don’t think this is the best solution…

Do you have any suggestion? Is there a way for having a custom extension?

Thanks in advance,

You just need to register a BinaryLoader for your extension to the assetManager.

Thanks as always Normen,
it works smoothly!

This helped me a bit for understanding how to use the code correctly: