I just gave it a try, and it's working perfectly!
Thank you so much :D

Is there a way to remove the need of the BatchConvert.js script, and make it work on just a drag/drop way on the moi3D.exe who have the script path in it ? or through a CMD maybe ?

Or, in the BatchConvert script, a way to tell him to convert every compatible files in that folder.

The idea would be to remove the need of writing the path of each files.