USB Drive folders/files with foreign characters display as ' ????? '

[flyingcar]

Software
XBian version: 1.0RC3
XBMC version: 13.2
Overclock settings: Default

Hardware
RPi model (model A/B 256mb/512mb): B+ 512Mb
SD card size and make/type: SanDisk microSDHCTM 8GB
Network (wireless or LAN): LAN
Connected devices (TV, USB, network storage, etc.):
-TV (HDMI)
-Western Digital 2TB External Hard drive (USB)
-Keyboard

Problem description:
When I browse through the files located in the Ext Drive any folders or file names that contain characters such as: カタカナ　と　ひらがな　漢字　è à ç
all show up as ??? (where each question mark represents one character)
I changed the font type to Arial and the local language to Japanese with character code set to Japanese as well, but no luck. It should be noted all the xbian menus and what not did display the unicode characters properly. I do not have this issue when I connect the Ext Drive to my windows laptop or desktop. After googling a bit I think it might be something do with not mounting the drive to accept UTF-8 characters in it's folder structure, but I dunno, I'm knew to linux and the like.
How to reproduce:
Any time I open up the Ext Hard Drive with Xbian.

Any help would be much appreciated!