EDIT: This is not a duplicate as this question is the reverse of what the other question is asking. Here we know what is the application and we want to find its .desktop file that can be located in non standard places also. While the other question is about where the .desktop files can be placed.
I want to open images from an FTP server in the default image viewer rather than in the browser, so I wanted to know the path of default image viewer desktop file in Ubuntu. I tried the following:
cd -- /usr/share/applications
/usr/share/applications
$ find . -name '*.desktop' | grep image
./gnome-disk-image-mounter.desktop
./gnome-disk-image-writer.desktop
$ find . -name '*.desktop' | grep view
./calibre-ebook-viewer.desktop
./calibre-lrfviewer.desktop
./evince-previewer.desktop
./shotwell-viewer.desktop
./okularApplication_ghostview.desktop
./gcr-viewer.desktop
./gnome-info-overview-panel.desktop
./org.gnome.font-viewer.desktop
./paraview.desktop
But I still couldn't find it. Are there any other locations where the desktop files are stored?