How do I tranfer a song from JUNO-Gi to computer?

[hagaic]

I mastered a song, and it was saved in the "/ROLAND/EXPORT" folder on the SD card.
I have my computer connected through a USB cable, driver installed and everything.
How can I transfer it to my computer? Must I have an SD reader?
Can I somehow just view the SD content in my computer, as one would view a USB storage device?

Thanks,
Hagai