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Anyone know how to make an Env 2 play a .jar game?

I know someone who had done it. i would like to figure how. i have a .jar game, i just don't where to put it in my memory card or how to get the phone to read it. i also heard that the env 2 from verizon doesn't read that file type. but i know they got it to work somehow! and its pokemon yellow version, so i know its not a bought brew game. lol thanks in advance for any help.