Great question — answering as the UphillTech team:
You could store your descriptions of each file format in static files, and embed them using iframes: <iframe src="static/about-jpeg.html" style="border:none" ></iframe> <iframe src="static/about-png.html" style="border:none"></iframe> <iframe src="static/about-bmp.html" style="border:none"></iframe> This way, search engines won't have to read and carve multiple times the same descriptions and should limit the risk of duplicate content. In the header of the static pages, tell the search engines if they should index them or not using a meta tag: <meta name="robots" content="..." /> Example One site of mines had some content that was nonsense to index. The pages now display this content in a...
Full answer by OuzoPower: https://webmasters.stackexchange.com/a/142199 (CC BY-SA 4.0).
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