Tremulous
Basic silent installer for Tremulous, "is a free and open source team-based first-person shooter with real-time strategy elements".
<package id="tremulous" name="tremulous" revision="1" priority="3" >
<check type="file" condition="exists" path="%PROGRAMFILES%\Tremulous\tremulous.exe"/>
<install cmd='"%SOFTWARE%\tremulous\tremulous-1.1.0-installer.exe" /S' />
<upgrade cmd='"%SOFTWARE%\tremulous\tremulous-1.1.0-installer.exe" /S' />
<remove cmd='"%PROGRAMFILES%\Tremulous\uninstall.exe /S' />
</package>