This method is called to allow the class object to specify the file title filters for instances of its class.

#define INCL_WINWORKPLACE
#include <os2.h>

M_WPFileSystem     *somSelf;   /*  Pointer to the WPFileSystem class object. */
PSZ                 psuccess;  /*  Success indicator. */

psuccess = _wpclsQueryInstanceFilter(somSelf);