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NS_E_WMPCORE_WEBHELPFAILED
What NS_E_WMPCORE_WEBHELPFAILED tells you
The result NS_E_WMPCORE_WEBHELPFAILED (0xC00D108E) means Windows Media Player could not launch the Web Help target associated with an error or command. The name is useful only when tied to the object and state that produced it; neighboring HRESULTs in the same subsystem can represent later stages.
Build a minimal reproduction
Record the fully resolved help URL, shell/default-browser association, launch policy, caller session, and ShellExecute result.
Keep those inputs stable while testing one prerequisite at a time. Verify the same URL opens through the supported shell path in that user context; changing playback codecs will not repair this boundary.
References
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