Ignore files under 2,000 KB (2 MB) as most of them are spam.
Gnutella is not the best place to obtain software from, many are not complete installs or are bugged etc.

When I see files under 2 MB I usually junk them if I suspect they are spam. ie: select file in search results, press trash can icon. I show Junk results at bottom of search results to be sure nothing is incorrectly labelled as junk.