I have edited the WPI.cmd to include usb but it doesn't seem to work. Here is the code I have used: @ECHO OFF REM REM WPI startup something. REM REM Example, how to look for CDROM-drive. Must have a file called WIN51 in its root. for %%i in (C D E F G H I J K L M N O P Q R S T U V W X Y Z) do if exist %%i:\WIN51 set CDROM=%%i: echo Found CD-Rom as drive %CDROM% REM Example, how to look for USB-drive. Must have a file called usb.txt in its root. for %%h in (C D E F G H I J K L M N O P Q R S T U V W X Y Z) do if exist %%h:\usb.txt set USB=%%h: echo Found USB as drive %USB%