What does HRESULT 0x80010103 (RPC_E_NOT_REGISTERED) mean?

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Description:

The requested COM interface is not registered or available on the target server object for this call.

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RPC_E_ATTEMPTED_MULTITHREAD	RPC_E_FAULT

RPC_E_NOT_REGISTERED

RPC_E_NOT_REGISTERED means that the target COM server does not have the requested interface registered for the object being called. It can result from a deployment mismatch, an unsupported interface version, or missing proxy-stub registration.

What to inspect

Verify that the server implements the requested interface ID and that client and server use compatible versions.
Check COM registration, proxy-stub registration, and bitness for in-process and out-of-process components.
Do not substitute a different interface ID without confirming the documented contract.

This is an interface-availability problem, not a missing CLSID activation error.

Microsoft: COM error codes

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