...
Highlight everything up to the last slash [\] which should be up to the first letter of the track name. \\192.168.12.195\Music\Playlists\_4_non_blondes\Iron Man\19 Iron Man.mp3
Now that the path is highlight highlighted press control H, which is "find and replace". The highlighted path should be filled in for find and for replace, leave it black. Next select replace all. Now all the tracks should not have a path and should only display its track name.
If this was all done on the NAS path (and this is the same path that is configured with the MMS) and you see your newly edited playlist in the media shared folder then you should be all set. Wait a few minutes for the server to upload the playlist and then test for functionality
If the playlist will contain content from more than one folder, the track path should contain the folder name as well. Using the above example, the path should look like this: \Iron Man\19 Iron Man.mp3
e.g.
\Iron Man\19 Iron Man.mp3
\Lemonade\Hold Up.mp3