Showing archive results for September 2026

Sep 22, 2026
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Footprint vs Payload files

Howard Kapustein

Payload files Payload files are files stored in and delivered by the package. This includes your code, assets, and data, such as executables, DLLs, images, configuration files, and resources. For example: Content files The term content is sometimes used in MSIX-related APIs and documentation, but it does not provide as clean a classifica...

Sep 15, 2026
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PackageType: Main, Framework, Resource, Optional, Bundle

Howard Kapustein

Every MSIX package is one of four package types: MSIX also supports Bundle packages. Bundles are somewhat different from those four package types: a Bundle is a container for one or more MSIX packages. Windows APIs nevertheless expose Bundle alongside the other package types when identifying packages. Each package type has its own behavior...

Sep 8, 2026
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MSIX PackageVolume: How Package Storage Works

Howard Kapustein

An MSIX package can be staged in several ways and locations: By far the most common is PackageVolume. We'll dig into the rest in future posts, but for now let's focus on MSIX PackageVolume. In the beginning... When MSIX first appeared in Windows 81 packages would be staged to a unique directory under . More specifically, packages were pl...

Sep 1, 2026
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Servicing While In Use and ERROR_PACKAGES_IN_USE

Howard Kapustein

How does MSIX service a package while it's in use? Simple: It doesn't. A core principle of MSIX servicing is: Do not service a package while it's in use. Deployment provides several ways to deal with that constraint. Options range from terminating applications to deferring servicing until the package is no longer in use. How hard can it be? '...