/usr/lib/ruby/vendor_ruby/mimemagic/overlay.rb is in ruby-mimemagic 0.3.0+dfsg-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 | # Extra magic
[['application/vnd.openxmlformats-officedocument.presentationml.presentation', [[0..2000, 'ppt/']]],
['application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', [[0..2000, 'xl/']]],
['application/vnd.openxmlformats-officedocument.wordprocessingml.document', [[0..2000, 'word/']]]].each do |magic|
MimeMagic.add(magic[0], magic: magic[1])
end
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