HOW ARE THE .MOD FILES GENERATED?

[Virolay]

Hello cyberponk,

I am a 72 year old retired engineer, trying to learn things about Arduino.

I do not know if you will receive this comment, if so, in addition to thanking you for these two Arduino models that have helped me a lot in my learning, I will greatly appreciate a simple explanation of how you have generated the files:
INOMICRO.MOD
INONANO3.MOD

Thanks and best regards from Madrid,