awesome thank you so much. i found this, i dont know if this is what you were talking about doing http://www.jbowers.com/mame/chdman.htm other than that i really dont know what to do. i have the md5 files and the chds, and chdman, i just dont know what to type into the command prompt because apparently its looking for a chd file instead of a md5 or something. i dont know what im doing can you explain it step by step please. thanks