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MILAVERR_WMPFACTORYNOTREGISTERED
The scope of MILAVERR_WMPFACTORYNOTREGISTERED is WPF media module activation and version compatibility. The Windows Media Player integration factory expected by the MIL path is not registered for activation. Keep 0x88980506 beside the returning method because a wrapper can replace this distinction with a generic subsystem message.
Common wrong turns
MILAVERR_MODULENOTLOADED can occur after discovery when a binary cannot load; this result points first to factory registration. 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.
Read the HRESULT in context
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.
COM class registration and activation of the WMP-backed media factory.
Evidence to preserve
- Requested CLSID and COM activation context
- 32-bit or 64-bit registry view and server path
- Windows Media Player feature state
- Underlying REGDB or loader HRESULT
A minimal test sequence
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.
- Check activation from the same process architecture.
- Verify the owning optional feature is installed and healthy.
- Compare per-user and machine registration views.
- Use servicing repair rather than arbitrary regsvr32 commands.
Technical references
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