How to create your own plugin?

[mamelicious]

Hello

I want to create my own DAT file.

https://docs.mamedev.org/plugins/data.html

So I made a LUA file called data_myfile.lua (in plugins/data folder) which reads the .DAT file (based on an existing LUA file).
But in MAME it doesn't appear in the DATs view.

Can somebody tell me what I need to do to make it appear?

[mamelicious]

Reinstalling MAME fixed the problem. There was probably something wrong or something I accidently changed but didn't remember.
Closed.