erm ... downloading files for mac osx requires some thought. Generally look for specific Mac items, else for those that have versions for multiple platforms, look for the ones that have mac or osx in their title.
Any file that has exe in its title is windows specific program. Setup.exe is typical windows app. Any file less than 2,000 KB or 2 MB is usually spammed viruses. Check thru topics here
http://www.gnutellaforums.com/downlo...load-help.html including music as it shows some of the typical spam file sizes.