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By the way, the .orc extension is just an extension, and not all of these files can be converted. I don't remember exactly, but one or two files definitely couldn't be converted... the developer initially planned to fix this, but never got around to it! However, there was a French-language website where they posted a mod with modified creature parameters... I can't remember the link right now, but I'll let you know when I find it! So, it seems they managed to find a solution!
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I haven't tried it myself yet, I haven't had the time. If it works, I'll let you know.