guys i am having an issue. i wanna play cadillac and dinosoures. i downloaded rom and put the dino.zip into the rom folder on n900. now when i start mame and try to run the game i always get an error says "The selected game is missing on or more required rom or CHD images. Please select a different game". i searched the issue and got something like unzip the rom file and zip again into the rom folder with the original file name. but either i am missing something or i didn't understand cause doing that didn't help me. so pls can any1 tell me how to get rid of this problem. thanks