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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
Category: Other Operating Systems - Int 21h - O
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