DosGetModName

#define INCL_DOSMODULEMGR

USHORT  rc = DosGetModName(ModuleHandle, BufferLength, Buffer);

HMODULE          ModuleHandle;  /* Module handle */
USHORT           BufferLength;  /* Buffer length */
PCHAR            Buffer;        /* Buffer (returned) */

USHORT           rc;            /* return code */