Slenderman Monster

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So how did my original modeler create this ent?

Probably by using the Model Editor.

Is my model viewer crashing because my new version has no ent?

You should be able to load a .dae file into the model viewer, too, as far as I know. You can of course try to create an .ent first and see if you can load that. (Or is the Model Editor crashing too?)

Which makes me think - why do you need to have the model in the model viewer at all? I mean, it's just that - a VIEWER right? So can't you just create your .ent file with the model editor and throw that into your level without using the viewer at all?
(Or maybe I'm talking bullshit again because I don't know anything about the pipeline that comes after exporting from Maya. If that's the case, Statyk or whoever is still lurking in this thread, please just hit me in the face with a frying pan or something.)