Nioh 3 crashing on PC can be annoying moment, especially when game closes with the fatal error before you even reach the main menu. Sometimes the game starts, displays a small error box and then closes on its own. In some cases, the error may say Fatal error! FileOpenError, which means the game is failing to open or read a required file.

This kind of crash is usually not about one single thing. It can happen because Steam files are broken, the antivirus blocked something, the game folder has a permission issue or Windows is not letting the game access a file properly. Sometimes driver or overlay problems can also trigger fatal errors, but for FileOpenError, you should first check file and permission-related fixes.

This guide will help you fix Nioh 3 crashing on PC, fatal error, FileOpenError, crash on launch, and Steam launch issue. Follow the fixes one by one. Do not apply all of them together, because then you will not know what fixed the problem.

Why Does Nioh 3 Fatal Error Happen on PC?

Why Does Nioh 3 Fatal Error Happen on PC?

There are many reasons Nioh 3 can crash on PC, because the game depends on your Steam files, Windows setup, game folder permission, antivirus, storage drive, graphics driver and runtime files. If one required file is missing, blocked, corrupted or not opening correctly, the game can stop and show fatal error.

Here are some main causes that can cause Nioh 3 fatal error or FileOpenError on PC:

  • Game files are missing or corruptedThe
  • Steam update did not install properly
  • Antivirus blocked or removed a game file
  • Windows Security is stopping the game folder
  • Steam does not have proper permission
  • Game folder is set to read-only
  • Steam download cache is broken
  • The game is installed on a bad or almost full drive
  • GPU driver or overlay is conflicting with the game
  • DirectX or Visual C++ files are not working properly

If the error is FileOpenError, treat it as a file access issue first. The game is trying to open something, but something on your PC is preventing that file from opening properly.

How to Fix Nioh 3 Crashing on PC

Fixing Nioh 3 crashing issue is not hard at all. You just have to follow the steps below one by one and test the game after each fix. Start with Steam file repair, admin permission and antivirus checks, because these fixes match FileOpenError better.

1. Restart Your PC and Relaunch Steam

Start with a proper restart. It sounds simple, but it can help when Steam or Windows keeps a broken process running in the background. Close Steam completely, restart your PC, reopen Steam then launch Nioh 3. If the game was crashing because of a temporary file lock or stuck Steam process, this can fix it without changing any setting.

2. Verify Nioh 3 Game Files on Steam

Verify Nioh 3 Game Files on Steam

If Nioh 3 shows Fatal error! FileOpenError, this is the first real fix you should try. One small missing or corrupted file can stop the game from opening properly. Steam has a built-in option that checks the full game folder and downloads broken files again.

Here is how you can do this:

  1. Open Steam.
  2. Go to Library.
  3. Right-click on Nioh 3.
  4. Click Properties.
  5. Open Installed Files.
  6. Click Verify integrity of game files.
  7. Wait until Steam completes the scan.
  8. Restart Steam.
  9. Launch Nioh 3 again.

Do not close Steam while the scan is running. If Steam repairs any file, restart your PC once before opening the game again. It gives the game a cleaner start after the repaired files are added.

3. Run Steam as Administrator

Nioh 3 may fail to open files if Steam does not have enough permission. This can happen when the game is installed in a protected folder, another drive, or a folder where Windows is strict with access. Close Steam from the system tray, right-click the Steam shortcut, choose Run as administrator, then launch Nioh 3 from your Library. If the game opens after this, the issue was most likely connected to permission.

4. Add Nioh 3 Folder to Windows Security Exclusion

Windows Security can sometimes block game files by mistake, especially after a new update. If it blocks a file that Nioh 3 needs during launch, the game may show FileOpenError and close before the menu. You should not turn off antivirus fully. A better way is to add only the trusted game folder as an exclusion.

Here is how you can do this:

  1. Open Windows Security.
  2. Go to Virus & threat protection.
  3. Click Manage settings.
  4. Scroll down to Exclusions.
  5. Click Add or remove exclusions.
  6. Click Add an exclusion.
  7. Choose Folder.
  8. Select the Nioh 3 installation folder.
  9. Restart Steam.
  10. Launch the game again.

After adding the exclusion, verify game files again on Steam. This is important because antivirus may already have blocked or damaged a file before you added the folder to exclusion.

5. Check Antivirus Quarantine

Sometimes antivirus does not just block the game. It can move one game file into quarantine, and then Nioh 3 cannot find it anymore. This can directly cause a FileOpenError because the game is trying to open a file that is no longer in the folder.

Open your antivirus app and check the quarantine, blocked files, or protection history section. Look for anything related to Nioh 3, Steam, or the game installation folder. If your game is installed from a trusted source, restore the blocked file and then verify the game files from Steam again. This fix is very useful when the game was working before, but started crashing after an antivirus scan or game patch.

6. Remove Read-Only Permission From the Game Folder

If the Nioh 3 folder is set to read-only, the game may not write or access some files properly. This does not happen to everyone, but it is worth checking when the error is related to file opening.

Follow these steps:

  1. Open Steam.
  2. Right-click Nioh 3.
  3. Go to Manage.
  4. Click Browse local files.
  5. Right-click the main Nioh 3 folder.
  6. Click Properties.
  7. Uncheck Read-only if it is selected.
  8. Click Apply.
  9. Apply changes to this folder, subfolders and files.
  10. Click OK.

After this, open Steam as administrator and test the game again. If Windows asks for permission during the change, allow it.

7. Clear Steam Download Cache

Steam download cache can cause problems when an update or installation does not finish cleanly. The game may look installed, but Steam can still keep old or broken download data in the background. If Nioh 3 started crashing after a patch, fresh install, or failed download, clear this cache once.

Here is how you can do this:

  1. Open Steam.
  2. Click Steam in the top-left corner.
  3. Open Settings.
  4. Go to Downloads.
  5. Click Clear Download Cache.
  6. Confirm it.
  7. Sign in to Steam again.
  8. Verify Nioh 3 game files after that.

This does not delete your installed games. It only refreshes Steam’s download cache, so Steam can check and repair the game with cleaner data.

8. Move Nioh 3 to Another Drive or SSD

If Nioh 3 is installed on a drive with low space, slow response, or file access issue, the game can crash while loading files. This is more possible with FileOpenError because the error is already connected to file opening. A nearly full drive can also create problems when Steam tries to update or repair the game.

If you have another Steam library folder, move the game there. An SSD is better if you have one, but even a healthy drive with more free space can help. Open Nioh 3 Properties in Steam, go to Installed Files, and use the Move install folder option. After moving the game, verify files again and then launch it.

Do this fix after the easier ones, because it takes more time. But if your game is on an old HDD or a nearly full drive, this step can make a real difference.

9. Update GPU Driver and Disable Overlays

If all file-related fixes fail, then check your GPU driver. Nioh 3 can crash because of outdated graphics driver, broken driver update, or DirectX related problem. Update your driver using NVIDIA App, AMD Adrenalin, or Intel Driver & Support Assistant, depending on your GPU.

After updating the driver, restart your PC. Do not skip this part. Windows needs a restart to load the new driver properly, and launching the game right away can still leave old driver parts active.

Also disable overlays for testing. Steam Overlay, Discord Overlay, Xbox Game Bar, NVIDIA Overlay, AMD Overlay, MSI Afterburner overlay and RivaTuner can sometimes conflict with games. You do not need to uninstall these apps. Just turn off overlays, test Nioh 3, and if the game works, enable them again one by one.

10. Reinstall Nioh 3 as the Last Option

Reinstalling Nioh 3 should be the last option, not the first fix. Most fatal error and FileOpenError issues can be solved with Steam file verification, antivirus check, admin permission, folder access fix, or Steam cache clear. But if the installed game folder is badly damaged, a fresh install can help.

Before uninstalling, check your save data. Make sure Steam Cloud is synced, or back up local saves if you know where they are stored.

Here is the better way to reinstall:

  • Uninstall Nioh 3 from Steam.
  • Restart your PC.
  • Open Steam again.
  • Install Nioh 3 on a SSD or healthy drive.
  • Do not add mods or overlays yet.
  • Launch the game with default settings.
  • Test it before changing graphics settings.

If the game still crashes after clean reinstall, then the problem is probably outside the game folder. At that point, check Windows Security, GPU driver, storage drive health, or wait and see if the issue started after a new game update.

What If Nioh 3 still shows a fatal error?

If Nioh 3 still keeps crashing, check the exact error message again. If it says FileOpenError, the issue is still likely connected to missing files, blocked files, folder permission, or antivirus. If the error mentions DirectX, GPU, or display driver, then focus more on graphics driver and overlay fixes.

Also think about what changed before the crash started. Did it happen after a Steam update? Did your antivirus scan the game folder? Did you update your GPU driver? This small detail can save time, because the cause is often close to the last change.

Before asking for help, write down the fatal error message, error code, your GPU model, driver version, Windows version, and whether Steam file verification found any missing files. A screenshot of the error box also helps a lot.

How to Prevent Nioh 3 Crashes in the Future

Once Nioh 3 starts working again, keep your setup clean. Let Steam finish updates fully before opening the game, keep enough free space on the game drive, and do not run too many overlays together. Also check antivirus warnings carefully, because one blocked file can bring FileOpenError back again.

To reduce future crashes:

  • Verify game files after a failed update
  • Keep Steam and Windows updated
  • Keep enough free space on the game drive
  • Use SSD if possible
  • Avoid blocking game folders with antivirus software
  • Do not use too many overlays together
  • Keep GPU driver stable and updated
  • Back up save files before deleting local folders

You do not need to check these things every day. Just remember this simple rule: if Nioh 3 says “FileOpenError” start with files, permissions, antivirus and Steam repair first.

Final Thoughts

Nioh 3 crashing on PC fatal error can look serious, but if the message says FileOpenError, the problem is usually connected to game files or file access. Start with Steam file verification, run Steam as administrator, add the game folder to Windows Security exclusion, check antivirus quarantine, and remove read-only permission from the folder.

If those fixes do not work, then clear Steam download cache, move the game to another drive, update GPU driver, disable overlays, and reinstall the game only as the last option. Test one fix at a time, because this makes it easier to know what solved the issue.

Did your Nioh 3 fatal error also show FileOpenError, or did it show a different code? Comment the exact error message and tell when the game crashes, like on launch, loading screen, or during gameplay.