here is how: download the program Winmount (you will need full version because otherwise it is restricted to 30 MB or so)
Youwave must not be running because otherwise the files will be in use.
go to c:\Documents and Settings\(your user name) and find the folder .Virtualbox open it and go to folder Harddisks.
inside you will see 2 files with the extention .vdi , these resemble the 2 SD cards (1 for portrait en 1 for landscape mode).
You can mount these files with Winmount (don't forget to switch off the read only tap) and they will act 2 drives on your PC.
Now you can copy MP3 's pictures etc to these drives. Unmount them again and startup YOUWAVE. When you press MUSIC on your
Android device you will see you mp3's and you can play them. TADAAAA.
would u pls tell me in details how to "switch off the read only tap" when doing the mounting procedure? ths