Locate the folder named with a long string of numbers (your unique user ID).

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Software that overlays text or graphics on top of your game can look like a malicious injection tool to anti-cheat systems. Try disabling overlays for these popular applications:

Launch the game (if it crashes before the main menu, skip to the manual step below).

Follow these troubleshooting steps in order to resolve the "Tampering Detected" message and get back to the battlefield. 1. Verify Game File Integrity

Here’s a concise review of the Age of Empires II: Definitive Edition issue related to the error, written from a player’s perspective.

Aggressive antivirus programs often flag the game's memory-scanning processes as suspicious behavior, triggering the tampering alert.

Many modern antivirus programs mistake AoE2:DE's anti-cheat components for malware. Adding the game folder as an exception often solves the problem instantly.

Mods are a frequent culprit for anti-cheat triggers, especially after a major game update. Launch the game (if it allows you to reach the main menu).

The is a frustrating issue that locks players out of multiplayer modes, greys out main menu options, or abruptly crashes active matches. This error is triggered by the game's built-in anti-cheat system when it detects a foreign process, corrupted file, or profile mismatch interacting with the game's memory layout.

Wait for Steam to scan and automatically redownload any corrupted data. Open the Xbox App and go to your library.

Open the application settings and disable the in-game overlay feature.