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     The special file control block has a drive code, filename, and
     extension in the usual position (bytes 0 through 0Bh) and a second
     filename starting 6 bytes after the first (offset 11h).
 
     The ? wildcard character can be used in the first filename. Every
     file matching the first file specification will be renamed to
     match the second file specification.
 
     If the second file specification contains any ? wildcard
     characters, the corresponding letters in the first filename are
     left unchanged.
 
     The function terminates if the new name to be assigned to a file
     matches that of an existing file.
 
     An extended FCB can be used with this function to rename a
     directory.
 
     Int 21h Function 56h, which allows full access to the hierarchical
     directory structure, should be used instead of this function.
                                    -♦-