According to the official web page of the Napoleonic era, new voice acting contributions are still welcome. The units of the new civilizations have received new sounds in their respective languages.
The mod also includes Matthew Sher's Unit Upgrades Modpack, so that the old standard units, such as the musketeer, get a new look each age you advance. The graphics was awarded by gamespy in their Picture of the Day contest in 2006. All of these new units have new graphics and statistics. A range of native units for the new maps are also introduced.
It includes not only new unique units for the new civilizations, but new standard units, such as the Fusilier, and new unique units for the civilizations featured in Age of Empires III: The Age of Discovery, such as the British Green jacket rifleman. More than 35 new units are introduced with the Napoleonic Era. Other gameplay changes include a new build limit on walls, and altered trading post prizes. More than 10 new maps featured includes Egypt, Scandinavia and the Alps. Players can also access new elite units, such as the sharpshooter, through the university. In this building, players will find a small amount of powerful nation-specific upgrades, as well as a two randomly generated ones. An all-new technology building, the university, is also introduced for all western nations. Several new technologies are available in several different buildings. A few elements from Age of Empires II are re-introduced, like the ability to have an unlimited amount of settlers on the construction of a building. Napoleonic Era features several new gameplay elements.
In addition, Napoleonic Era downloads use compressed files, creating need for a file decompressor, e.g.