You have an emulator, you don't burn it. Put the app folder on your sd card, look inside it and make sure you see boot.dol, if you see something-else.dol rename it to boot.dol. This is for any homebrew.
Your sd card should look like this
sc-card:/apps/(homebrew app folder)/boot.dol
If you play backups you will most likely download a torrent of the game as a rar. Unrar the iso from the rar. An iso is an image of a disk-exact copy. You then burn the iso to dvd with imgburn.
wii64 is still in development, probably wont work how you want. You will have much better results with snes, etc.