/usr/share/mimelnk/application/x-scratch-project.desktop is in scratch 1.4.0.6~dfsg1-5.
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 | [Desktop Entry]
Encoding=UTF-8
Type=MimeType
MimeType=application/x-scratch-project
Comment=Scratch Application
Comment[es]=Aplicación de Scratch
Icon=scratch.png
Patterns=*.sb;
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