Compatibility: 1.0+
Expects: AH    17H
DS:DX address of a special-format FCB
                                                                  
Returns: AL    0    if the file was renamed successfully
0ffH file not found, new name already exists, other error
                                                                  
Info: Renames a file in the current default directory.  Use the
following layout for renaming files with this function:

     0=default, 1=A, 2=B, etc.
offset  len                                                  
+0     0cH  drv  F   I   L   E   N   A   M   E   E   X   T         oldname
                                                 
+0cH    6          reserved         
                                              
+11H   0bH   F   I   L   E   N   A   M   E   E   X   T             newname
                                              

Either name may contain ? wildcard  characters:
  In the oldname a wildcard causes a search for all matches in
the default directory and renames each matching filespec.
  In the newname it means: use the same character as found in
that position in the oldname.

Notes:   This function allows you to rename a directory by using an
Extended FCB with the proper file attribute for the oldname.

See Also: Fn 56H (rename/move file)
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DOS Fn 17H: Rename File via FCB