pymsi might work if you're okay with Python. It's on pypi with the package name python-msi, and then you get a CLI utility called pymsi that has options for dumping info on an MSI file and extracting files, as well as being able to import pymsi to use it in your own Python scripts. There is also an interactive web demo similar to lessmsi if you want to try it out and get a sense of what it can handle.