Compatibility: 3.0+
Expects: AH    5bH
DS:DX address of an ASCIIZ  string of a filespec
Returns: AX    error code if CF is set to CY
file handle (if no error)
Info: This call is identical to DOS Fn 3cH (create file), except that
it will fail if the file already exits on the named drive and

DS:DX points to an ASCIIZ string in the form...
If the drive or path is omitted, defaults are assumed.

The file is opened for read/write in compatibility Access Mode.

Fn 6cH has a options which include this capability.

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DOS Fn 5bH: Create New File