Media Player starts minimized when following audio file is opened with it during miniplayer mode

When I open a music file with Media Player I can switch to miniplayer mode (that is always on top and just shows the music cover image). Now, when I open another music file (by double clicking it), the Media Player switches back to normal mode and minimizes in the task bar (which is even worse).

How can I make it stay open in miniplayer mode and just play the new file?