I bought a secondhand machine for internet use in France. On this site one day and read about someone finding loads of jpeg files on their machine that they weren't aware of. Always one for a tinker I did a search on mine and it threw up hundreds of jpeg files from previous owner, 99% porn. Wiped them but wondered if there are any other file formats that are used for this "trade". The thing that worried me was suppose it was really nasty stuff and someone else saw them and reported me to the authorities. I could be tarred with a very undeserved brush.