/usr/share/mimelnk/application/x-xoj.desktop is in xournal 4.7-1ubuntu1.
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 | [Desktop Entry]
Encoding=UTF-8
Type=MimeType
MimeType=application/x-xoj
Icon=xoj
Patterns=*.xoj;*.XOJ;*.Xoj;
Comment=Xournal note file
Comment[fr]=Fichier Xournal
Comment[ca]=Fitxers de nota del Xournal
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