MacOS – Find out which app created a file

I keep seeing a number of text files being created in a particular folder on my mac. I've a feeling that they are being created by a widget I downloaded, however I thought I'd removed the widget months ago.

They're simple text files with a ".torrent" extension and are created in my Movies directory. It looks as though something "listening" to torrent trackers for release of Public Domain programs and automatically creating the torrent files for them ready to be picked up by a torrent app.

Is it possible to find out what application created a file? I'd like to track down which app it is so I can kill it for good – if there are other ways to find it I'd appreciate comments!

Edit:

Thanks to a reply I tried out fseventer. I deleted the files, started recording, then went about doing various things. After about 30mins the files returned without any action from me, so I stopped fseventer and reviewed the log. It had only recorded things I had done manually, nothing automated.

So, any other ideas? This is really starting to annoy me as they never go away (for long)!