Hi!
We have a problem with uploading files in infopath. Previously we had the same problem but fixed that by changing a registry key.
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{00000566-0000-0010-8000-00AA006D2EA4}]
When we upgraded our client computers with XP SP2 it was no longer sufficient to change this ...