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MILAVERR_MODULENOTLOADED
The scope of MILAVERR_MODULENOTLOADED is WPF media module activation and version compatibility. A media module required by the WPF integration path is not loaded or could not be made available. Keep 0x88980505 beside the returning method because a wrapper can replace this distinction with a generic subsystem message.
Subsystem boundary
When it is returned, 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.
Inspect the following boundary: module discovery, loader compatibility, or initialization before the media object is usable.
Do not hide the original condition
MILAVERR_WMPFACTORYNOTREGISTERED is specifically about the WMP factory registration; MODULENOTLOADED is broader. 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.
Facts worth preserving
| Record | Why it matters here |
|---|---|
| Module name and path when available | In this result diagnostics, recording module name and path when available ties the HRESULT to the WPF media module activation and version compatibility boundary rather than to the final visible failure. |
| Process architecture, OS build, and WPF runtime version | Comparing process architecture, OS build, and WPF runtime version shows whether this result follows input, object state, or environment. |
| Loader events, dependencies, and code-signing result | Preserving loader events, dependencies, and code-signing result provides the evidence needed to test this distinction: mILAVERR_WMPFACTORYNOTREGISTERED is specifically about the WMP factory registration; MODULENOTLOADED is broader. |
| First COM or LoadLibrary-related HRESULT | Recording first COM or LoadLibrary-related HRESULT separates the WPF media module activation and version compatibility boundary from a later wrapper symptom. |
Isolation procedure
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.
- When it is returned, reproduce in a process with matching architecture.
- Check the module and its dependencies through loader diagnostics.
- compare with an inbox media path on the same system.
- When it is returned, repair the owning Windows feature or application deployment rather than copying one DLL.
What each result would imply
| Test | Interpretation | Hold constant |
|---|---|---|
| Same environment, reduced input | If this result disappears with a smaller faithful case, complexity within WPF media module activation and version compatibility is implicated. | Keep module name and path when available fixed while simplifying loader events, dependencies, and code-signing result. |
| Same input, fresh object generation | If this result changes after rebuilding state, examine ownership across source reader, media-type negotiation, clock, decoder, mixer, presenter, and WPF visual. | Place process architecture, OS build, and WPF runtime version on the timeline of the last successful transition. |
| Same operation on a controlled second path | If this result follows one environment, the failure is not explained by source data alone. | Compare process architecture, media stack version, rendering tier, adapter, and session state while preserving first COM or LoadLibrary-related HRESULT. |
Verification after repair
A correction for it should let the operation at the WPF media module activation and version compatibility boundary complete repeatedly under the original supported conditions. Repeat the control that begins with “Reproduce in a process with matching architecture” and confirm that the following lifecycle step also succeeds. Keep the original failing sample and one deliberate negative case so fallback cannot be mistaken for repair.
Technical references
When it is returned, these references define the public API family, object model, or error list used to interpret this status.
- Microsoft Open Specifications: HRESULT values.
- Microsoft: Multimedia overview for WPF.
- Microsoft: MediaElement class.
- Microsoft: MediaClock class.
- Microsoft: WPF graphics rendering tiers.
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