changing extention from gcm to iso

can any one give me idiot proof instructions on how to change the extention from gcm to iso so that i can burn gamecube games to mini dvd .i keep hearing people say just change the extention file but no-one says how, any help would be greatly appreciated.

cheers

 

erase the .gcm, add .iso. That simple

 

oh yeah, and you must have your system show extensions, if you need help doing that, just ask.

 

thanks for the help guys got it worked out in the end

 

I have a stupid question that I need help on. I am trying to audio fix some of my games using fix helper. Any walkthrough for that would be helpful, but that isn't my question. Fixhelper only recognizes gcm files, but my games are in iso format. When I changed the gcm to iso I just renamed the file extension as iso. Now, it won't let me change the iso extension back to gcm. What do I do?