If you are talking about mameboy, yes, that's the reason. For now keep roms in the main memory at

\program files\mameboy\roms


> Hi!
> I found problem with storing rom in storage in my Japan version E700.
> I installed program in the main unit, but it can't find the rom folder in
> storage card.
> I gress one reason is in the Japanese OS the "storgae card" name is in Japanese,
> and the software cannot find the directory.
>
> Please help.
>