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This is an unofficial expansion for Age of Empires II, great game. The expansion adds some new stuff, not sure what but it also contains the fix for colour issues when playing AoE in windows 7/8.
[EDIT] if you dont have the game, you can purchase it for $10 on amazon http://www.amazon.com/Age-Empires-2-Pc/dp/B0049WF6FY/ref=sr_… or get it through "other ways"
I lost my AoE 2 disk somewhere and uninstalled it ages ago… But probably wouldn't end up playing this anyways.
Also I wouldn't call this a "bargain" since it is not generally worth anything and in my eyes is a mod (similar to something like Black Mesa).
EDIT: If it was official then sure it could be considered a freebie.