I don't know if you're using Apache, but I figured I'd throw this on the ground for people to gawk at. What Web server are you using? I had a similar problem trying to upload binary data using a local installation of Apache on a Windows box (forgive me) and Active State Perl. Every time I tried to upload a file, it was corrupted. When I ported the same script over to Linux, my only change was the shebang line and the script worked perfectly. From what I read at apache.org, Apache for Windows is a beta product and I stepped on a bug. Hope this helps.