I believe that snes9x is a super nintendo emulator and for super nintendo the screenshot archive has a modifed zSnes.  
Doh!  You are right, I wasn't thinking too hard.  

  Yes, for SNES, you're best bet is to use Zsnesw which is located at my site. Thanks for that TalkingOctopus, and thanks for the VirtuaNES tip - I think I'll modify it and perhaps add it to the site with the others.  Or at least add the modifed line there for future reference.