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ERROR_SXS_DUPLICATE_PROGID
ERROR_SXS_DUPLICATE_PROGID — Two components in the activation context publish the same COM ProgID.
A ProgID is a human-readable COM identifier. Two directly or indirectly referenced assemblies declared the same ProgID, so Windows cannot create a deterministic activation context for the application.
This is usually a deployment or manifest dependency conflict. The useful evidence is the pair of assemblies named in the SideBySide event or sxstrace output.
What to check
- Trace the failing launch and identify both manifests that contribute the same ProgID.
- Remove duplicate app-local versions of the COM component instead of registering more copies.
- Verify that the application package and its private assemblies were installed as a matching set.
Microsoft: Application manifests
Microsoft: About Side-by-Side assemblies
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