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If your friend also has rmxp you can just zip it(the whole folder). I use winrar for that. Or if your friend doesn't have rmxp when you open the game in the rmxp editor under file there is a button that compresses data. Although I would like to believe that's all but then I think that you need to change somethings on the scripts but you are just sending it to a friend so I don't believe there is anything to worry about that.