Thank you for your response!
The reason I want to access 256MB card is that I installed a dictionary for Palm through Garnet. When I open that dictionary it says "dictionaries cannot be found". I searched google for solution to this problem. If I worked directly with a Palm device, I would have opened memory card of that Palm device and manually copied dictionaries to specific folder. However, I use Palm emulator (garnet) and don`t have access to memory card which garnet uses for installed applications.

I already tried to create needed folders on 2GB card but unfortunately it didn`t work.