Making a custom item

hi guys, so im trying to make a custom model for grim dawn, I am trying to create ainz from overlord but whatever program i use, i am unable to find one that works with .msh which is what the game runs on. I made my model in .glb and i have another model as mdl but i Cannot convert to msh. even online converters all give it as stl which wont work.

Im really confused what to do, if someone knows how to convert it. i also noticed that the models are separated into 2 parts, 1 is .msh and 1 is for texture. Im just not sure what to do.

also if there is a way to use my model as is, which is either .glb or .mdl without converting, that knowledge will also be much appreciated.

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you need 3ds max and plugins : look on modding tutorials