qa.hlp (Table of Contents; Topic list)
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Int 21H Function 43H
   Summary  Notes  Example  Back
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▀ Bits 3 and 4 of register CX must always be clear (0) when this function
  is called; in other words, you cannot change an existing file into a
  directory or volume label. However, you can assign the "hidden" attri-
  bute to an existing directory with this function.
 
▀ [3.0+] If the program is running on a network, the user must have Create
  access rights to the directory containing the file whose attribute is to
  be modified.
                                    -♦-