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They should be in the _(Models) folder. You can easily identify these files by the fact that they don't have an extension and have a long name consisting of random characters. As for how to open them in Maya, that's a separate topic; I'm not sure if you can open them directly. I know that there are special utilities, and some people, like psatkha, know how to use them (please forgive me, psatkha, for this subtle advertisement).