/usr/lib/ruby/vendor_ruby/mime/types/image.nonstandard is in ruby-mime-types 1.25-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | *image/pjpeg :base64 =Fixes a bug with IE6 and progressive JPEGs
image/x-bmp @bmp
image/x-cmu-raster @ras
image/x-compressed-xcf @xcfbz2,xcfgz =see-also:image/x-xcf
image/x-hasselblad-3fr @3fr :base64
image/x-paintshoppro @psp,pspimage :base64
image/x-pict
image/x-portable-anymap @pnm :base64
image/x-portable-bitmap @pbm :base64
image/x-portable-graymap @pgm :base64
image/x-portable-pixmap @ppm :base64
image/x-rgb @rgb :base64
image/x-targa @tga
image/x-vnd.dgn @dgn
image/x-win-bmp
image/x-xbitmap @xbm :7bit
image/x-xbm @xbm :7bit
image/x-xcf @xcf '{XCF=http://git.gnome.org/browse/gimp/tree/devel-docs/xcf.txt}
image/x-xpixmap @xpm :8bit
image/x-xwindowdump @xwd :base64
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