Not sure why the error code. But there are fakes out there, meaning you can never actually download them possibly due to their upload slots all set to zero.

I googled the error code. Possibly due to WMA or WMV file which Quicktime & iTunes cannot handle. It is possibly due to the file being DRM copyright protected. Of course WMA/WMV files are commonly used to spam the network. I'd recommend filtering these file extensions out.

However if you already have WMA files, Flip4mac can handle them. VLC can also.