well if its a demo you are talking about then all you have to do is start up empires, open the console and type in "playdemo lol.dem" and it will start up.
Here, from the lol.dem thread: To play the demo file, copy the lol.dem to your \SourceMods\Empires\ folder and type in console: playdemo lol Just fixed the download link to *here* (old one was broken)