/usr/share/app-install/desktop/imagemagick-6.q16:display-im6.q16.desktop is in app-install-data 15.10.
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=imagemagick-6.q16
X-AppInstall-Popcon=0
X-AppInstall-Section=main
Version=1.0
Name=ImageMagick (display Q16)
Comment=Display and edit image files
Exec=/usr/lib/i386-linux-gnu/ImageMagick-6.8.9/bin-Q16/display %f
Terminal=false
Icon=display-im6.q16
Type=Application
Categories=Graphics;
Keywords=Image;Slideshow;View;Transform;Enhance;F/X;Special Effects
MimeType=image/avs;image/bie;image/x-ms-bmp;image/cmyk;image/dcx;image/eps;image/fax;image/fits;image/gif;image/gray;image/jpeg;image/pjpeg;image/miff;image/mono;image/mtv;image/x-portable-bitmap;image/pcd;image/pcx;image/pdf;image/x-portable-graymap;image/pict;image/png;image/x-portable-anymap;image/x-portable-pixmap;image/ps;image/rad;image/x-rgb;image/rgba;image/rla;image/rle;image/sgi;image/sun-raster;image/targa;image/tiff;image/uyvy;image/vid;image/viff;image/x-xbitmap;image/x-xpixmap;image/x-xwindowdump;image/x-icon;image/yuv;
X-Ubuntu-Gettext-Domain=app-install-data
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