.PER File Extension
Age of Empires Personality File
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What is a PER file?
Artificial intelligence (AI) file used by Age of Empires (AoE), a real-time strategy game; contains settings for how the computer player makes decisions; may specify parameters for building units or for how large an army needs to be before attacking; created as part of the scenario design process for a campaign.
Since PER files are saved using plain text formatting, you can edit them with a text editor.