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How can I change the image from *.iso to *gcm? I have tried it over MS-Dos, but after starting Dolphin Teaser, it crashed. What can I do?

if it crash, that means the game dont work on the dolphin. To change the filename just change the extension from .iso to .gcm. theres no difference between them.

Ok, thanks. Is there a other emulator where I can try the game?

there are other gc emulators out there but none as good as dolphin.