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In order for your application to show up in menus and/or to be automatically associated with mime types in file browsers, you need to provide a .desktop file like follows:
[Desktop Entry] Type=Application Exec=your-app %u MimeType=application/x-your-mime-type; Icon=some-icon X-DocPath=yourapp/index.html Terminal=false Name=Your App GenericName=Some Generic Name Comment=Short Description Of Your App Categories=Qt;KDE;
Take a look at the .desktop Free Desktop Spec to find our more about the key/value pairs above. It's important to pick a good set of Categories, see the spec for a list of valid values.
In your project you need to take care the .desktop file is distributed to the appropriate place. In case you are working on a qmake based project, add the following to your .pro file:
target.path = /usr/local/bin desktop.path = /usr/share/applications desktop.files += your-app.desktop
INSTALLS += target desktop
Note that the bold strings above should be in your project anyway.