This template is used to show there is a TXT version for items rendered in wikitext. The main article should always be in the Document: namespace.
Fill in the blank with your TXT file. You do not need to include the "file" or "media" prefix when copying your file link as that is already included in the template.
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This infobox can overlap text on your page in which case you will need to place several line breaks after it until it clears your text. It should be placed as the very first item on the page unless that will not fit gracefully with the article.