USAGE_OPENFILE structure.

typedef struct _VIEWFILE {
  ULONG               ulMenuId;  /*  Menu ID, if an association or menu page. */
  LHANDLE             handle;    /*  Open handle. */
  HWND                hwndCnr;   /*  System use only (window animation). */
  PMINIRECORDCORE     pRecord;   /*  System use only (window animation). */
} VIEWFILE;

typedef   VIEWFILE   * PVIEWFILE ;