This function enumerates the entries of a compound file. mmioFindElement is a 32-bit function that is also provided as a 16-bit entry point.

#define INCL_MACHDR
#include <os2.h>

ULONG    ulCode;        /*  Enumeration code. */
PSZ      pszElement;    /*  Pointer to element name. */
ULONG    ulElementLen;  /*  Length of element buffer. */
PSZ      pszFile;       /*  Pointer to compound-file name. */
ULONG    ulReserved;    /*  Reserved. */
ULONG    rc;            /*  Return codes. */

rc = mmioFindElement(ulCode, pszElement, ulElementLen,
       pszFile, ulReserved);