This function determines the storage system of the media data object.

#define INCL_MMIOOS2
#include <os2.h>

PSZ          pszFileName;         /*  Media object file name. */
PMMIOINFO    pmmioinfo;           /*  Pointer to MMIOINFO. */
PFOURCC      pfccStorageSystem;   /*  Pointer to the FOURCC. */
PSZ          pszParsedRemainder;  /*  Pointer to the parsed file name. */
ULONG        rc;                  /*  Return codes. */

rc = mmioDetermineSSIOProc(pszFileName, pmmioinfo,
       pfccStorageSystem, pszParsedRemainder);