I've giving up trying to ORCA an .msi installer to allow software to install on W2K3 (v5.2). It take so much time and effort. What about a simpler way? Just hack or replace a dll so that winver reports XP SP3 rather than W2K3 SP2. Then all XP software will load on my workstation. Including .exe installers. Does anyone know how to do this? Must say, didnt find any useful tips after googling. PS. pls dont suggest "right click properties run as..." This questions is for installers that are bombing saying "windows unknown" etc.