http://www.mediafire.com/download/7p4x4339pzfligp/GPFConveter.zipThis is a simple app. Just plug 00/02/04/06 codes into the textbox, press "Save GPF", and it will create a proper gpf file for you to use with Gecko OS.
Name the gpf file after your game. For instance, Tales of Symphonia is RT4EAF, so I named my file "RT4EAF.gpf". Place the resulting file in SD:\patch\ (e.g. SD:\patch\RT4EAF.gpf )
GPF files are codes that are written only once, right after the game loads. So a data hack (like inf health) won't work because it must write during each frame to work. But just about every ASM patch works. Data tables that are only read from (e.g. Tales' encounter and experience tables) also work.
This is useful if you have a ton of codes and you're hitting the code limit. You can put the ASM patches into a gpf file to save code space.
EDIT:
BTW, the text box is cleared of all non-code related info. So you can copy and paste pretty liberally into it. You do not need the *'s, but if they are there from whatever you copy from, they get parsed out.