If the files are currently a .TXT file format then there are really no formatting of tables in a way Word can interpret/convert. The .TXT table is just created by manually spacing/tabbing to align the data into columns to give the appearance of a table. You would have to add borders manually in Word. You might have some luck doing a copy of the TXT table and paste into Excel then add the border and then copy that into Word. Messy but it might be quicker.
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