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https://github.com/dark-knight404/DarkThumbs

Me and DK101 coloborated to bring you DarkThumbs.
A program that created windows thumbnails for EPUB files (and CBZ, CBR, ZIP, RAR)

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Super easy to use. Download the installer, run setup.exe, install it, open DarkThumbs shortcut on the desktop and check the ones you would like thumbnails on.

For installers click on Releases on the right tab.