egrep for windows

[Gesuato Emanuele]

Hi there,
 
I'm using egrep for windows and it seems impossible to redirect the
output to a file (or more probabily i'm doing something wrong)
I'm doing this command:
 
D:\Emanuele_Gesuato\logs_httpserver\access_log.20100702>d:\Emanuele_Gesu
ato\egrep\egrep.exe "HTTP/1.1\" 500" access_log.
20100702 > pippo.txt
 
but i got the output in the console and at the end i got the error
"pippo.txt file not found".
 
How to do for redirect the output in a file ?