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     RSD   Rename Sub Directory

           this program will allow the user to change the name of any
           sub directory on drives ( a - k ).
           RSD assumes that the sub directory to be renamed is in the
           root of whatever drive you choose. if it isn't, preface it
           with the proper path.
           for instance, rename sub dir 'aaa\bbb' to 'aaa\ccc'.

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