I was looking for something free. I had already found Filtrix. Anyway, to see if I'd like it, I downloaded the demo. The help is nonexistent, even though there's a clickable link. And when I try to run a conversion, I get an exception error, file access denied, even though the user account has access to all files. When I click on the alert, the program closes. If the demo is this poorly behaved, I can imagine the problems I'd have with a purchased version.