Use the mmioCFAddEntry function to add an entry to the CTOC chunk of an open RIFF compound file. (Do not duplicate entries.) The mmioCFAddEntry function requires a pmmctocentry parameter which identifies a pointer to a user-supplied CTOC structure containing the CTOC data. The "identifier" for the entry is the element name, which is passed in the pmmctocentry buffer. If mmioCFAddEntry expands the current number of entries past the number currently allocated, on a mmioCFClose the CTOC is written following the CGRP in the file.