INT 21 - DOS 2+ - "CREAT" - CREATE OR TRUNCATE FILE
        AH = 3CH
        CX = file attribute
            bit 0: read-only
                1: hidden
                2: system
                3: volume label (ignored)
                4: reserved, must be zero (directory)
                5: archive bit
                7: if set, file is shareable under Novell NetWare
        DS:DX -> ASCIZ filename
Return: CF clear if successful
            AX = file handle
        CF set on error
            AX = error code (03h,04h,05h) (see AH=59h)
Notes:  if a file with the given name exists, it is truncated to zero length
        under the FlashTek X-32 DOS extender, the pointer is in DS:EDX
SeeAlso: AH=3Dh,AH=5Ah,AH=5Bh,AH=93h