Jim,
IIS 6.0 on Windows 2003 has a file named metabase.xml which resides in the folder C:\Windows\system32\inetsrv .
By default, this file has this entry:
AspMaxRequestEntityAllowed = "204800"
This limits upload size to 204,800 bytes. You can change that to a large value (such as 2000000000 for 2 gigabytes) to allow your Windows 2003 server to accept large uploads.
If your server does not allow the Metabase Edit-While-Running feature, you will need to stop the IIS service before you can save the metabase.xml file.
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