/usr/share/mimelnk/application/libreoffice-oasis-text-flat-xml.desktop is in libreoffice-common 1:5.1.2-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Version=1.0
Encoding=UTF-8
Hidden=false
Icon=oasis-text
Type=MimeType
Patterns=*.fodt
MimeType=application/vnd.oasis.opendocument.text-flat-xml
Comment=OpenDocument Text (Flat XML)
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