Tune In adds to library

Hi,

When I use the "Tune In URL" to play a media file located on the computer running LMS (but outside the Media Folders), the file is added to the library. I discovered this when such a file was played as part of a Random Mix playlist some days after I played it using Tune In.

Is there a way to avoid this?

I'm running LMS 8.1.1 on Windows.

Thanks,
Lars