How Windows App Compatibility Works — Keeping Old Apps Alive with Compatibility Mode, Shims, and Compatibility Administrator (archived 2026-08-30)
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Abstract
Why checking Compatibility mode can make an old app start working. This article explains the underlying shims (API hooks), what the representative shims do, how to roll them out with Compatibility Administrator and sdbinst, where they stop working, and how to decide between life-extension and migration. Archived version of https://comcomponent.com/en/blog/windows-appcompat-shims-compatibility-mode/, as published on 2026-08-30. The live article is maintained and may change after this date. First published 2026-08-20.
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View paper (DOI)Open access versionOpenAlexZenodo (CERN European Organization for Nuclear Research)Published 2026-08-30
Authors: Go Komura
Institutions: Fujikura (United States)