I wrote a script to convert Windows Playlists to Linux Playlists and put it in my dropbox if you would like to use it.
https://www.dropbox.com/s/ag0ufzguiqtvdpv/dostounixm3uAfter downloading it, give it execute permission - "chmod 755 dostounixm3u".
From Windows JRiver, export your Playlists.
Copy the Playlist directory to your Linux machine.
Run the command with no options and it will prompt you for 3 things. In this example, Windows path M: gets converted to /Music. The script will also convert all the back-slashes to forward-slashes.
$ dostounixm3u
Enter Directory Containing Playlists: /Data/Playlists
Enter Windows Path: M:
Enter Linux Path: /Music
Converting ./Beatles (Mono).m3u
Converting ./Speaker Audition.m3u
Converting ./Yoga/Yoga Ambience 3.m3u
Linux Playlists are in /Data/Playlists_linux
Next step is to import /Data/Playlists_linux from JRiver in Linux. Then they will appear under "Imported Playlists". Unfortunately you cannot drag-drop to move Playlists around in Linux yet. See
http://yabb.jriver.com/interact/index.php?topic=88074.0 for how to get around it.