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Int 21 Fn 5B - DOS 3+ - Create New File [D]
AH = 5Bh
CX = file attribute (see AX=4301h)
DS:DX -> ASCIZ filename
Return: CF clear if successful
AX = file handle opened for read/write in compatibility mode
CF set on error
AX = error code (03h,04h,05h,50h) (see AH=59h)
Notes: unlike AH=3Ch, this function will fail if the specified file exists
rather than truncating it; this permits its use in creating semaphore
files because it is an atomic "test and set" operation
under the FlashTek X-32 DOS extender, the filename pointer is in DS:EDX
See Also: AH=3Ch,AH=5Ah
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