It would be helpful if you explain exactly what you've tried to do thus far, and what exactly happened when you did it. Modification of text files is no different than modification of HTML files; modification of .doc/.docx files is only slightly different insofar as you need to use the Inspectors that work with binary content (e.g. the HexView) and avoid those that only work with textual content (e.g. the TextView).
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