Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 21h Function 43h
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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" attribute to an existing directory with this function.
 
     [Version 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.
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