How do you what it is without downloading it? If you have downloaded it, then bad news for you: The FBI is going to arrest you within the next few days. Have you considered that the FBI is actively sharing archive material on Gnutella to capture lolipedo-fins?
Besides, the IP addresses shown for search results are far from being any evidence. The only way to find out who really shares something, is to download a file and *then* check the IP address. However, due to the vast amount of hijacked machines nowadays, it is not so unlikely that the uploading party is just a victim and not even aware of sharing or possessing these files. There have been exactly such cases even before Gnutella existed. Fairly normal people have lost their existence because of false-accusations concerning "child abuse". People are good in jumping to conclusions with any facts at hand.
Using Microsoft Windows whilst being connected to the internet is a modern version of Russian roulette. Unfortunately, most of the time the irresponsible computer are not the ones who are affected by hit. At least I've never heard of anyone losing his job or friends because his computer had been turned into a spam spewer.
I wouldn't suggest to anyone searching for "kiddie porn" or "child porn" anywhere. If you do, expect getting lynched by some random admin or bystander who is on a crusade because you are "obviously" a lolipedo-fin in search of material.
I could be wrong but I would actually assume the vast amount of real (not faked) child porn is produced in Russia or Asian countries, not in the US. That's none of the FBI's business anyway. Last but not least, keep in mind that even if all lolipedo-fins that appear in any available material have been executed/killed/jailed the material will still be available.