First of all, get 7-Zip.
It's easy to use and it's free.
Using a different program to extract the files will not delete the ones you have now.
Second, download a different copy of Zelda.
27MB is way too small for that to be real.
@Xdqwerty, to answer your question, they're a fusion Brit-pop/J-pop/electronic band with a woman vocalist. Flamingo is hands down their best known song but they've got a ton of other really good songs