Thanks Paul.
Ihave tested with your test, if I upload inside cgi-bin the cgitest.exe the server says me the 404 error. If I rename the file to .cgi then server shows me the error about CGI waiting... like at the beginning. If I rename the file to .php server shows me in IE the content of the file: "MZ..." so file is there.
Now I think the problem is only with IIS 6.0 or my hosting provider.
Does anyone know if there is a way to install IIS 6.0 on XP?
To Spanish users: Do you know any hosting provider with unlimited and external CGI support?
Thanks.