.sit icons

Many of the icons on InterfaceLIFT are in a .sit format. How do I open these? (Leopard 10.5.2)

Stuffit Expander
http://www.stuffit.com/mac/

Well I know that, but once I open it up, It just opens microsoft word and nothing else happens. This happens with all .sit files I try to open.

try get info on a .SIT file, then, go to open with, choose stuffit, and then check the box to do this with all files.

There isn't a Stuffit option :/ Whenever I search for it on Spotlight it doesn't show up

Um...then install Stuffit.

Better yet: Don't install stuffit!

They force you to give them your email address to download the free version of Stuffit expander.

Get The Unarchiver instead.

It will take care of nearly every archive format you'll ever come across and is completely free:
http://wakaba.c3.cx/s/apps/unarchiver.html