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MILAVERR_INVALIDWMPVERSION
MILAVERR_INVALIDWMPVERSION belongs to WPF media module activation and version compatibility. The available Windows Media Player integration does not satisfy the version contract expected by the MIL client.
What the status establishes
The WPF media integration path historically depends on registered modules and COM factories. Discovery, activation, bitness, interface negotiation, and runtime version are separate boundaries. A file existing on disk is not evidence that the expected class is registered in the caller’s registry view or that the activated object implements the versioned contract MIL expects.
interface or runtime-version compatibility during factory initialization.
Reduce the scenario safely
Record CLSID, module path, registry view, process architecture, activation HRESULT, and queried interface version. Compare a clean supported system image rather than copying DLLs or registry entries between machines.
- Compare on an unmodified system with the same OS servicing level.
- Repair mixed or partially serviced media components.
- Avoid private deployment of inbox WMP binaries.
- Test both activation and a minimal open operation after repair.
Evidence to preserve
- Reported WMP runtime and interface version
- OS and WPF build numbers
- Process architecture and deployment manifest
- The version check and any preceding activation result
Keep neighboring failures separate
This differs from a missing registration: the component is found far enough for its version to be rejected. Do not treat the constant name as a complete root-cause report; preserve the nested media, COM, graphics, or driver result before resetting the player.
Technical references
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