Compatibility: 2.0+
Expects: AH    3cH
DS:DX address of an ASCIIZ  string of a filespec 
CX    file attribute  (can't be a volume label)
                                                                  
Returns: AX    error code if CF is set to CY
file handle if no error
                                                                  
Info: Creates an empty file, or deletes all data from an existing file.
The file is open for read/write operations.

DS:DX points to an ASCIIZ string in the form...
d:\path\filename.ext 0 
...which identifies the location and name of the file to create.
If drive and/or path are omitted, defaults are assumed.

If CF is set on return, an error code is in AX and no action was
taken.

Notes:   The file is opened with an Access Mode of read/write.

  if the file already exists:
  When opened, it is truncated to a length of 0.
  If its file attribute is read-only, the open fails
(its attribute may be changed via Fn 4301H).

  Fn 5bH (create new file) is similar, but fails if the file
already exists.

  Fn 6cH has additional options, such as disabling critical
errors and forcing automatic write-through to disk.

- -

DOS Fn 3cH: Create a File via Handle