If like me you hate seeing MegaCD sound files on your media player you can stop media player indexing it.

You need to edit the tracker config file (/home/user/.config/tracker/tracker.cfg)

look for the line

# List of directory roots NOT to index and NOT to watch (separator=; )

NoWatchDirectory=

and at the end put: $HOME/MyDocs/.documents/PicoDrive/;

also if you do not want Sygic maps mp3 showing do:

$HOME/MyDocs/.documents/PicoDrive/;$HOME/MyDocs/Res/;

then

in terminal "tracker-processes -r" (it will take while for phone to find your normal audio/video files)

This is not for every one so becareful when doing this, if your are not sure how to please do not attempt it.

(credit to Rob1n for helping me)