Steam Content File Locked — What It Means & How to Fix It

What Does This Error Mean?

The 'Content file locked' error appears when Steam tries to update a game but can't write to the game's files. Another program (often antivirus) is holding those files open, or the files are marked read-only. Steam can't update what it can't write to.

Affected Models

Steam (Windows)
Steam (macOS)
Steam (Linux)

Common Causes

Antivirus software is scanning or locking the game files during the update process
The game's folder or files are set to read-only
Steam does not have write permission on the drive where games are installed
A previous failed update left corrupted or locked files behind
The game is still partially running in the background

How to Fix It

Close Steam and any games completely. Open Task Manager (Ctrl + Shift + Esc), check for any game processes still running, and end them.

Files in use by a running process are locked and cannot be updated.
Add Steam's game library folder to your antivirus exclusions. The default location is C:\Program Files (x86)\Steam\steamapps. Restart Steam and try the update again.

Antivirus software scanning game files in real time is the single most common cause of this error.
Check the game folder permissions. Navigate to the Steam library folder > steamapps > common > [Game Name]. Right-click the folder > Properties > Security. Make sure your Windows account has Full Control.

If the folder is read-only or your account lacks write access, Steam can't update it.
Run Steam as administrator. Right-click the Steam shortcut > 'Run as administrator'. This gives Steam full write access to all folders.

This is especially important if your games are installed on a drive other than C:\
If the error persists, verify the game's integrity. Right-click the game > Properties > Local Files > Verify integrity of game files. This repairs corrupted files from a failed update.

A previous failed update may have left broken files that are causing the lock. Verification replaces them.

When to Call a Professional

Content file locked is a permissions or antivirus issue. No professional help is needed. If the error only affects games on an external or network drive, that drive's sharing permissions may need adjustment.

Frequently Asked Questions

Why does 'Content file locked' happen on every update for the same game?

If antivirus is the cause, it will lock files on every single update until you add an exclusion. Add the entire Steam library folder to your antivirus exclusions once and the error should stop recurring.

Is it safe to add my Steam folder to antivirus exclusions?

The risk is low. Steam games go through Valve's distribution system, and your antivirus still scans files when they're first downloaded. Most security professionals consider it acceptable to exclude the steamapps folder from real-time scanning.

Can a full drive cause content file locked?

Yes. If the drive Steam is installing to is completely full, it can't write the update files. Check your available disk space and free up room if necessary. Steam game updates can range from a few megabytes to tens of gigabytes.