The question that needs to be asked here is how to get all installers using MSI. MSI is a secure, declarative format which runs off MS code in known directory.

The question that needs to be asked here is how to get all installers using MSI. MSI is a secure, declarative format which runs off MS code in known directory. Because it's declarative, it can also be queried and tracked. I recently packaged an installer using it and it worked really well. WiX has terrific documentation and it was straightforward.