Penumbra Monster Amnimation conversion?

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If I understood correctly, he just wants to use the original Rock worm and its animations in Amnesia, not bind something different to its joint hierarchy So in theory you shouldn't need Maya for that... unless the .dae files were an earlier version that Amnesia's tools can't read. But I doubt it.

Now in my early days of Amnesia, I tried simply renaming a Penumbra's 'animation' to the Amnesia's type, but it didn't work.

Hm...what exactly didn't work? Did the editor crash or something? Did you try opening a .dae_anim file with the model viewer or did you try adding animations to the mesh - .dae file in the model editor and save the result as a .ent?