This looks like a server setting- I do relatively large uploads (some larger than 10 meg) with CGI.pm regularly and it works flawlessly on a mod_perl'd apache/linux box.

Plus, the status code is probably coming from IIS, unless there's a part of your code that returns a 413 (doubtful, and you'd know it.) Can't help you much about where to tweak the IIS settings, though, I'm pretty much a *nix guy.

-Any sufficiently advanced technology is
indistinguishable from doubletalk.