I am on MacOSX 10.5.2

Recently i have been unable to open or install most programs downloaded from Limewire . What happens very often is that when I click on the zip file that came form limewire, I get a file called "setup.exe".

If I click on this I get a text message in code. No installer, no program just a page of code that i have no idea what to do with.

These should be Mac programs but i seem to get the impression that "setup.exe" is a PC thing.

What's up with this?

Lenny