Which application launcher do you mean?? Like an icon in your desktop or a menu item? To create a application launcher in your desktop, for example, if you want to create a launcher to launch vim, create vim.desktop in ~/Desktop:
Code:
[Desktop Entry]
Encoding=UTF-8
Type=Application
Exec=vim
Terminal=true
Name[en_GB]=Vim
chmod +x it.
The syntax is quite easy to understand, just change it to fit your needs.