INT 7F - Alloy NTNX, MW386 - GET NTNX FILE MODE
        AH = 26h
        CL = 00h
Return: AX = file mode bits (see below)
Note:   MW386 does not support file modes, and always returns AX=001Fh
SeeAlso: AH=26h,AH=26h/CL=06h

Bitfields for file mode bits:
 bit 0  directory protection enabled
 bit 1  extended open enabled
 bit 2  flush on every disk write
 bit 3  flush on every disk write in locked interval
 bit 4  flush on reads from simultaneously opened file

.