Int 21 Fn 64  U - OS/2 V2.1+ Virtual DOS Machine - Get Second Sft Flags W  [O]

   AH = 64h
   DX = 0005h (function number)
   CX = 636Ch (magic value, "cl")
   BX = 0000h (indicates special request)
   DI = DOS file handle

Return: AX = value of second flags word from OS/2 SFT entry for file

Notes: if CX is not 636Ch on entry, INT 21/AH=6Ch is invoked, because a bug
     in OS/2 1.x FAPI erroneously called AH=64h instead of AH=6Ch
   the OS/2 SFT has two flags words rather than DOS's one word, and this
     function provides access to the word which is not present in DOS