msixbundle

msixbundle is a packaging artifact used in the MSIX framework for Windows applications. A file with the .msixbundle extension serves as a bundle that aggregates one or more MSIX packages into a single distributable unit. Bundles are designed to simplify distribution of apps that ship multiple variants, such as different CPU architectures (x86, x64, arm64) or language localizations, by allowing a single download to cover all variants while the installer selects the appropriate package for the target device.

Structure and behavior: A bundle contains a bundle manifest that lists the included MSIX packages and specifies installation rules. Each member is a separate MSIX package, which may itself target a specific architecture or locale. The bundle is digitally signed to establish trust and integrity.

Installation and updates: On supported Windows versions, bundles are installed with the App Installer or with PowerShell via Add-AppxPackage. The App Installer can automatically pick the suitable package based on the device’s architecture and language, and can coordinate updates for all included packages as a single transaction.

Benefits and use cases: MSIX bundles reduce redundant downloads when distributing software that ships multiple variants and enable atomic installation and updates across the contained packages. They also simplify versioning and delivery in enterprise or storefront environments.

Compatibility: msixbundle is part of the MSIX ecosystem and requires Windows 10 or later with MSIX support. Some tooling and deployment pipelines may require additional steps or App Installer manifests to manage updates.