disk on key and winCe version 3.01

Good Morning,

  I have a general question about "disk on key". I have bought 
recently an disk on key or memory disk and it isn't recognize by my 
personal assistant a easymate 800 H/PC personal assistant from 
packard bell with WinCe version 3.01 (and a mips 4000 processor)and a 
usb port. Normally it is for a mouse and in the windows Ce you have 
the driver. But there are no other drivers installed in windows Ce 
3.01.
  When I go to the site of the key manufacturer, he doesn't have a 
driver for such a windows Ce (only for windows Ce 4.0). So I would 
like to know if it is possible to see the contents of my usb key on 
my personal assistant and what i should do in order to see it if it 
is possible ? Do you know if a driver for windows Ce 4.0 will works 
with windows Ce 3.01 ?

Your faithfully.

Eric thivant