wgames automatically creates a .desktop file for a game when wgames installs it. The game .desktop files are created in /home/user/.local/share/applications/hildon/ .

Just fyi, if you r using catorise and want it to see the .desktop shortcut under the games section, you have to copy this .desktop file to /usr/share/applications/hildon/, then edit /opt/catorise/menu, where you have to add something like 'nfsuc: games' (if the name of the file is nfsuc.desktop). Then open the catorise gui, and save menu.