Use MSIDiff to Compare or Disassemble Windows Installer Databases

Here's a nifty tool I found that makes working with MSIs a real joy.... Exaggeration? maybe, but this tool's sweet (and free).

A common use MSIDiff is to automate changes you wish to apply over and over again to MSIs produced by other tools.

To do this you start by first manually making (and testing) the proposed changes using a table editing tool similar to the free "ORCA" tool and then using MSIDIFF to generate the code to perform these changes.

The generated output (typically with minor changes) is then executed via the (also free) MAKEMSI tool (you may have made it more generic so parameters are passed into it).

Download MSIDIFF here.