Ooo, do tell me which Wii SNES emu plays .rar files, and how you've got a Wii version of Zsnes!
I was initially gonna go into rant mode on you here ("you're posting from the PC you're gonna use? FUCKIN' TRY IT YERSELF!!", etc etc) but I'm in a good mood, plus if you're new to emulators you can be forgiven for thinking your rom gets altered, even if rom stands for Read Only Memory......
Once you plug in your Wii's sd or usb into your PC you
should also easily find a FFV '.srm' file, this is your save game. (When I say 'should', this can depend on the emulator you use - if you use snes9xgx there's a good chance it'll be in \snes9xgx\saves, RetroArch? Probably in the roms directory - if you can't find it, simply search the drive)
This should then work on your PC emulator..... tip: Don't use Zsnes as it's rather crap, and was only useful back in the Pentium MMX days (ahhh memories!!) - either go for snes9x 64bit or Bsnes.