Alright, so I got that preview thing fixed now, it works with a script added to the editor. But my problem now is: The WED won't import the models I had imported before. It will give me the option, show me the model, and I can click import and choose which textures and stuff to import, but then it won't do it.

What could be the mistake?

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When I import template models, some of them can be previewed just fine, while others give the error "Skin0.pcx: Bad WMB format".