Rust "Untrusted System File" error: how to fix it
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Last checked
September 25, 2026
Rust shows an "Untrusted System File" error.
Also appears as: Untrusted System File, rust untrusted system file, rust eac untrusted system file
Facepunch says the game loaded a system DLL that failed an integrity check, which indicates system-level corruption on your own PC. Facepunch also says it can indicate a virus infection.
What to try
- 01Run `sfc /scannow` in a command prompt opened with administrator rights. Facepunch says this fixes it in most cases.Confirmed
- 02Run a full antivirus scan; Facepunch says the error can also point to a virus infection.Confirmed
- 03Install all available updates through Windows Update.Confirmed
Did this fix it for you?
Your answer helps the next player know whether these steps are worth trying first.
Hit this error? Leave a comment
Say where you are, what you see on screen, and whether any fix worked for you.
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What people are saying
Notes from players who've hit this one — no time limit, an answer from months ago is still an answer.
- Nothing reported here yet.
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