Hi , c:\users\guyz\documents\im\otp90q emulator\pc_sw\visual\usb_balk\usb_balk\bulkusb.h(23) : fatal error C1083: Cannot open include file: 'wdm.h': No such file or directory i get this error ,and i want to add include path so my application can go to the right place get the *.h files. Here is the include line: #include <wdm.h> and the file located at : C:\winddk\6000\inc i would like to add this file to my pathes.