Usb connect to Cpu not view

good evening i am doing an application in c # on visual studio with pp customized i would like to read the data from a usb connected in the cpu..so i can write it via ftp Entering in win ce mode I see the usb connect to pendant and the disk chip but not the usb connected to the cpu why? There is a parameter for enable the view in win c’è? the controller is yrc1000 thank you very much