INT 21 U - OS/2 v1.x FAPI - "DosENumAttrib"
        AH = 6Eh
        ???
Return: ???
Note:   also supported by OS/2 v2.0+ Virtual DOS Machines
SeeAlso: AX=5703h,AH=6Fh"OS/2",INT 2F/AX=112Dh

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