passing properties to msiexec

Let's imagine I've passed properties with their 开发者_开发技巧values to msiexec that aren't defined anywhere in my msi package. Do those properties get created, or are they ignored?

Yes, they get created. Once you pass a property via msiexec command line, you can address them as if you define them directly in Property table. Windows Installer gurus might point out differences (if there are), but in terms of usage I didn't notice any.