I just got a bunch of roms and they dont have the file extension on them which is .SMC. So basically i have to individually add .smc to each one. Is there any way i can add it to all of them with one click. Thanks i have about 700 of them.
Just try getting different ROMS from a different source. Or you might just have to add them all manually.
Are you sure they don't have them? Go on your folder options and turn off "Hide known extensions" before you start adding .smc to all of them, since you'll end up with something like sonic.smc.smc if you add it and it's already there.