@mattmame i don't see any bios for gamecube in recalbox needings. Do i need it? Which is the filename?

Hello,
I tried to transfer two isos of gamecube (Mario Sunshine, .gmc format, Beach Spikes Volleyball, .iso format) on the PC where i run the last version of Recalbox but when i try to start them they return to the menu without starting.
The PC is a Intel NUC i3-7100u with Intel HD 620 - 16GB RAM.
Is there something that i miss to correctly start gamecube emu? Dreamcast ISOs works perfectly (tried Daytona).
Thank you