/usr/lib/ruby/vendor_ruby/mime/types/other.nonstandard is in ruby-mime-types 1.25-2.
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 | !chemical/x-pdb @pdb =use-instead:x-chemical/x-pdb
!chemical/x-xyz @xyz =use-instead:x-chemical/x-xyz
*!drawing/dwf @dwf =use-instead:x-drawing/dwf
x-chemical/x-pdb @pdb
x-chemical/x-xyz @xyz
x-conference/x-cooltalk @ice
x-drawing/dwf @dwf
x-world/x-vrml @wrl,vrml
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