Play all music of this folder doesn't seem to work

Unless I'm missing something, the Play all music of this folder option in a collection doesn't seem to play, at least not in WinAmp. The individual items do seem to play correctly.

For example, the collection at

http://dev.marklewisworks.com/...imalsFood-clips

plays the individual clips, but the Play all link seems to give the same url as the collection folder page itself, which is probably not correct:

http://dev.marklewisworks.com/...imalsFood-clips