Hm. These tracks underscore why Roger needs to get back with the band. "To Kill a Child" sounds like a rehash of "What God Wants", and the Beirut song sounds like something left on the cutting room floor of the "The Final Cut" sessions.
I agree with his lyrics and overall message, but his music has gotten really stale without Gilmour and the boys.
As for converting the files, just copy the link location from your browser, open it in WinAmp, and use WinAmp's "disk writer" plugin. Then encode it in MP3. You lose a little quality from the transformation, of course.