INT 21 - DOS 2+ - "CREAT" - CREATE OR TRUNCATE FILE
        AH = 3Ch
        CX = file attributes (see below)
        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
        DR-DOS checks the system password or explicitly supplied password at
          the end of the filename against the reserved field in the directory
          entry before allowing access
SeeAlso: AH=16h,AH=3Dh,AH=5Ah,AH=5Bh,AH=93h,INT 2F/AX=1117h

Bitfields for file attributes:
 bit 0  read-only
 bit 1  hidden
 bit 2  system
 bit 3  volume label (ignored)
 bit 4  reserved, must be zero (directory)
 bit 5  archive bit
 bit 7  if set, file is shareable under Novell NetWare

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