This function determines the storage system that contains the media data object.

#define INCL_MMIOOS2
#include <os2.h>

PSZ          pszFileName;        /*  File name. */
PMMIOINFO    pmmioinfo;          /*  Pointer to MMIOINFO. */
PFOURCC      pfccStorageSystem;  /*  Storage system pointer. */
ULONG        rc;                 /*  Return codes. */

rc = mmioIdentifyStorageSystem(pszFileName,
       pmmioinfo, pfccStorageSystem);