Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 21h Function 56h
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     The function fails if
 
        ■ Any element of the path name does not exist.
        ■ A file with the new path name already exists.
        ■ The current path name specification contains a different disk
          drive than does the new path name.
        ■ The file is being moved to the root directory and the root
          directory is full.
        ■ [Version 3.0+] The program is running on a network and the user
          has insufficient access rights to either the existing file
          or the new directory.
 
     The * and ? wildcard characters are not allowed in either the
     current or new path name specifications.
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