Digest Auth in Wininet for WinCE

Hi,
I am developing a s/w related to HTTP Digest Auth through Wininet.
But I met a problem that I use the same code in Win32 and WinCE 5.0,
but they act differently about HTTP Digest Auth. In Win32, the code
acts normally; but I WinCE 5.0, I always can not pass the HTTP Digest
Auth( it always return error code 401). Is the implementation of
Wininet different about HTTP Digest Auth? Or I have another way to
build a library that support HTTP Digest Auth?

Thanks a lot..
.