There was never a native PlayStation Portable (PSP) version of Age of Empires III. Consequently, there is no standard ISO file that can be loaded directly into PPSSPP to play the full PC game. Most "new" downloads found online under this keyword are often:

While there is no official PSP release of Age of Empires III for use with the

The build was optimized for emulation before native PSP hardware:

What's Coming in 2026 for Age of Empires and Age of Mythology

If you search the internet and find files claiming to be "Age of Empires 3 for PPSSPP," you are likely encountering one of three things: