Microsoft has published a comprehensive guide to MSIX packaging format. You can read more about the Microsoft MSIX program and their partners here. Here are some of the key benefits of the Readiness automated solution: 
- Designed and architected as a modular, extensible platform
- Input format: anything that installs on Windows*
- Supported Output formats: MSI Installer, MSIX, App-V
- Support for custom: installs, builds and packaging processes
- Built-in algorithmic rules for MSIX suitability
- Integrated testing platform for automated “smoke testing”
You can find out more, especially with our Assurance offering.
