Hello! You have downloaded some effects presets for Dither Boy.
If you don't already have Dither Boy, more info at:
https://studioaaa.com/ditherboy/
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To Install:
1) Open Dither Boy v4.0 or later
2) In the menu bar, look for and click on the third item named "Adjustments"
3) Under "Presets" click on an Import option
4) Navigate to the download location, click import
Your newly installed presets will be available in the Dither Boy menu!