m3u playlist adding duplicates due to capitalization on file location

When I do a 'Scan For Media', when it adds the tracks, it does so with a completely lowercase path in the location. I have some .m3u playlists which I've also added. These were created in Media Monkey, the files have relative paths, and contain the correct case as per the file they're pointing to.

When I add the .m3u playlists to Songbird, due to the differing capitalization, it recognises the references in the .m3u as different tracks, so adds them to my main library again producing many duplicates.

So I have two instances of the track in my library, one with the correct capitilization from the .m3u playlist, one completely lowercase from what Songbird added.

Is there anyway around this? My music is on a fileserver which I access using multiple computers using both Linux and Windows. That is why I use .m3u playlists with relative filepaths, I want one set of playlists for all my computers. So messing around with. or using alternatives to, my playlists isn't really an option. If I can't find an appropriate solution I'll just use a different player.