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MQ_ERROR_NO_ENTRY_POINT_MSMQOCM
Retry and cleanup
Match the installer and DLL build rather than registering the file repeatedly.
This result is narrower than a generic load failure: legacy setup loaded or located MSMQOCM but could not resolve the entry point it expected. Compare the installer build with the MSMQOCM binary version and architecture from the same installation source; mixing setup files from different Windows or MSMQ generations can reproduce this exact contract mismatch.
Avoiding a false diagnosis
Do not copy retired DLLs or recreate obsolete registry topology until the originating MSMQ generation and component are proved. Code-specific condition: legacy setup DLL version mismatch.
Example
References
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