Just passing through, and thought I'd mention that if you're using Server 2008\Win7 or Server 2012 R2\Win8.1, etc. you can use PowerShell to iterate all computers in your domain (or a specific list of same), and subsequently interrogate those computer's Registry remotely, to cull for installed Autodesk apps.
PowerShell is built-in (aka FREE), and you need only have sufficient Active Directory permissions, etc.
Cheers