I used FlashGet to download it from your site. It worked well with Lunar 2, so I figured it should be okay to use it on others.
And the file wasn't corrupt when I completed downloaded it.
I load Lunar SSS into Gens, and it works alright until a little past the 'title screen', with the title of the game "LUNAR" fades in and out, assumably correctly. It doesn't go past there, however.
Any suggestions?