hi bo
have you jailbroken your ipad?
i did that and installed xbmc for ios
then i configured the wl-hdd's built-in samba
and access video files stored on wl-hdd from xbmc
both avi files and mkv files working for me
standard-definition files work flawlessly
720P files will play but are a little bit laggy especially the hi-bitrate ones
for xbmc installation guide do some googling using key word"xbmc ios"
hope this will help