Rust Untrusted System File: What Does This EAC Warning Mean?
Getting Untrusted System File in Rust? Learn what the EAC integrity warning means and how Windows System File Checker and security scans can help.
An "Untrusted System File" warning can prevent Rust from launching correctly.
The message may name a Windows DLL or another system component.
Because the notification comes from Easy Anti-Cheat, players may assume it indicates a ban.
Facepunch's documentation points to a different explanation.
What Is an Untrusted System File?
Facepunch explains that the game loaded a system DLL that failed an integrity check.
This indicates a possible system-level corruption problem.
The issue may involve damaged Windows files or malicious software.
Why Does File Integrity Matter?
Windows applications depend on system libraries.
If an important file is corrupted or modified unexpectedly, other software may be unable to trust it.
EAC checks certain components as part of its security process.
How to Fix the Error
Step 1: Check Windows Updates
Install available supported Windows updates.
Restart if required.
Step 2: Run System File Checker
Facepunch recommends Microsoft's System File Checker tool.
Open an elevated Command Prompt and run:
`sfc /scannow`
Allow the scan to complete.
This Windows utility checks protected system files and attempts to repair supported corruption.
Step 3: Scan for Malware
Facepunch also recommends a full antivirus scan.
Use Windows Security or another reputable security product.
If malware is detected, follow the security product's recommended cleanup process.
Step 4: Review the Error Again
After the repairs and restart, launch Rust through Steam.
If the warning continues, collect the complete file name and error text for support.
Is This an HWID Ban?
An Untrusted System File warning is not the same as an EAC Banned notification.
A hardware spoofer is not a Windows file-repair tool.
Conclusion
The correct starting point for Untrusted System File is system integrity.
Windows updates, System File Checker and a malware scan are more relevant than unrelated ban-related software.
Official resource: https://support.facepunchstudios.com/hc/en-us/articles/115001271745-Untrusted-System-File
See also: Start Service Failed.