Based on your comments on your question and the comment on Viruthagiri’s answer, you want to edit your documents and attachments using WordPress. I’m afraid WordPress doesn’t offer a feature to edit documents and images using their backend. The only thing I can say is to either use an FTP client (WinSCP [free] is a good one for PC, and Cyberduck [free] or Transmit [$39] for Mac OS X) to upload and replace the files in the WordPress upload directory.
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