IBM Developer  :  https://www.ibm.com/developerworks/cn/linux/l-cn-dtef/index.html

 

[Desktop Entry]Name=firefoxComment=firefoxExec=/usr/local/firefox/firefoxIcon=/usr/local/firefox/browser/chrome/icons/default/default128.pngType=ApplicationStartupNotify=true Categories=Network  #category on menu

 

about Categoruies: 

cat /etc/xdg/menus/application.menu

cd /usr/share/desktop-directories

http://www.jb51.net/os/RedHat/523235.html