How to Fix the FileCoAuth.exe Application Error on Windows 11

If you use OneDrive on Windows 10 or 11 and are constantly getting the FileCoAuth.exe application error that says "The instruction at 0x00007FFF9FA4B826 referenced memory at 0x0000023DF8E00000. The required data was not placed into memory because of an I/O error status of 0xc000007f. Click on OK to terminate the program". This guide will walk you through all the currently known solutions that will get rid of this problem.

How to Fix the FileCoAuth.exe Application Error on Windows 11

As always, there are a ton of common causes, including corrupted registry entries, damaged OneDrive program files, failing cryptographic verification, and files missing due to disk errors or improper shutdowns. A system with heavy background usage may repeatedly attempt to restart the co-authoring service, causing more frequent crashes. Even if OneDrive appears to be running, FileCoAuth.exe may silently fail in the background until the underlying problem is corrected. Since it is a bit of a looping issue, it can be tricky to diagnose and fix.

Restart the Computer (Temporary Fix)

If you are in a rush and just need to solve this problem quickly and temporarily, a full restart clears temporary system conflicts that prevent FileCoAuth.exe from starting correctly. After rebooting, check whether the error returns during normal desktop use or when opening Office documents stored in OneDrive. This isn't a fix, but it will buy you some time.

Clear Storage Space

Insufficient storage will quite often cause OneDrive and Windows to fail when loading certain components. So clear out any large or unnecessary files from locations such as Downloads, Desktop, Documents, and your local OneDrive folders. After freeing space, reopen OneDrive and monitor whether the application error appears. You can use the Disk Cleanup tool for this process. Simply search "Disk Cleanup" from the start menu, then follow the steps.

Run a Full Virus Scan

Although it's not all that likely to be the cause, some malware and viruses may interfere with or replace the genuine FileCoAuth.exe. So, perform a complete system scan using Windows Security to detect suspicious files. The authentic executable should only exist within the OneDrive installation folder. Remove threats and restart the system after the scan.

Use the SFC and DISM Corruption Fixers

If nothing so far has worked, it's time to use some of Windows' built-in specialty tools to find and fix any corruptions.

• Type cmd in Windows search, right-click on Command Prompt, and select Run as administrator.
• When UAC shows up, click Yes.
• Copy and paste the following command, pressing Enter.

• Wait till the scan is finished. If Windows finds system file integrity violations, it will attempt to fix them. After this, use the set of the following commands, pressing Enter each time:

Update Windows

Outdated system components can cause the co-authoring service to malfunction. Install all available Windows updates to ensure compatibility with the latest OneDrive features. After updating and restarting, open a shared document to confirm that FileCoAuth.exe loads without errors.

Uninstall and Reinstall OneDrive

If you it all the way down to this point, just uninstall and reinstall OneDrive. There aren't many other options available, and you probably don't want to clean install Windows just yet!