Where can I find documentation that describes the meaning of error codes returned by regsvr32, such as 0x80070716?
The error is defined in winerror.h. Microsoft's reference is at System Error Codes.
In my case the error code is 0x0716, which is 1814L. This error code corresponds to ERROR_RESOURCE_NAME_NOT_FOUND.
I think it means you don't have adequate permissions. See winerror.h:
#define FRS_ERR_INSUFFICIENT_PRIV 8007L
And this on interpreting HRESULTs.
Edit:
Wrong bits, it's actually:
#define ERROR_RESOURCE_NAME_NOT_FOUND 1814L
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