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Dragging and dropping my file onto this window or pushing any button just makes the window close.

you have to drag it onto the exe file in the explorer. this runs the program on the model.

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Hey Ventilator, would it be tricky to add a feature to the converter where you right click on the MDL file and there would be an option like "Split with Modelsplitter"? Or is that not possible with command-line apps like this one?

it would be possible but i don't know how. but you could try this: right click a mdl -> open with -> browse for and choose modelsplitter.exe -> then you should have modelsplitter.exe in the "open with" menu besides med from now on

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(P.S I have a model which modelsplitter somehow can't handle (but it's a pretty big and complex one) so I'll mail it to you soon..)

there seems to be a memory leak which could cause problems for models with lots of huge internal textures! i will upload a fixed version soon... if you have enough ram the old version should work fine though! <edit> a new (hopefully) fixed version is up now! please tell me if it works! </edit>