/usr/share/app-install/desktop/comix:comix.desktop is in app-install-data 0.12.04.4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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X-AppInstall-Package=comix
X-AppInstall-Popcon=1530
X-AppInstall-Section=universe
Encoding=UTF-8
Name=Comix
GenericName=Comic Book Viewer
Comment=A viewer for comic book archives
Exec=comix %f
Icon=comix
Terminal=false
Type=Application
StartupNotify=true
Categories=Application;Graphics;Viewer;
MimeType=application/x-cbz;application/x-cbr;application/x-cbt;image/jpeg;image/png;image/gif;image/tiff;image/bmp;image/x-icon;image/x-xpixmap;image/x-xbitmap;application/x-zip;application/zip;application/x-rar;application/x-tar;application/x-gzip;application/x-bzip2;image/svg+xml;image/svg;image/svg-xml;image/vnd.adobe.svg+xml;text/xml-svg;image/x-portable-anymap;image/x-portable-bitmap;image/x-portable-graymap;image/x-portable-pixmap;image/x-pcx;image/x-cmu-raster;image/x-sun-raster;image/x-tga;
X-Ubuntu-Gettext-Domain=app-install-data
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