mmioCFFindEntry Return Value - rc

rc (ULONG) - returns

Return codes indicating success or type of failure:

MMIO_CF_SUCCESS

If the function succeeds, 0 is returned.
MMIOERR_INVALID_HANDLE
The handle passed was not valid.
MMIOERR_INVALID_PARAMETER
For this function a pszElementName, pchBuffer, or cchBytes NULL is invalid.
MMIOERR_READ_ONLY_FILE
The RIFF compound-file is opened as read-only.
MMIOERR_CF_ENTRY_NOT_FOUND
System failed to find CTOC entry.
MMIO_CF_FAILURE
The function failed. A call to mmioGetLastError might return one of the following errors:

MMIOERR_WRITE_ONLY_FILE

File not opened in read mode.
MMIOERR_INTERNAL_SYSTEM
The operation failed due to an internal system error.

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