Minecraft Decompressor: http://www.youtube.com/watch?v=whanjyHhBO4 How to Permanently Mod Creative into Survival: http://www.youtube.com/watch?v=Hjy8BhzVCnU
Can this be reversed ? For example mod it to creative and after mod it back into survival ? Are you wanting achievements ?
This has been patched since 2013, as the contents of a decompressed savegame.dat file are now just gibberish. Anyone know of a way to do this with the current Minecraft?