[LAU] Boss BR-80 (SD card question)

Hello all, I'm thinking of getting a Boss BR-80, which is a little portastudio-type device. I've found a couple of old threads about using one as a USB soundcard, which seems to resolve one of my queries, but I have another. I'd like to be able to plug the SD card into my computer, and save the audio files, so I can edit and mix externally. I think that the device will master to wave file, but saving individual tracks seems to require a Windows conversion utility. That is of no use to me. I don't even know what filesystem is on the SD card. Does anyone have one of these? Could someone shed some light on this for me? If not, I might buy one anyway, and report my findings back here. Thanks all, Michael