brian
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Are you trying to launch the game Schedule I and getting the frustrating error:
“Failed to load custom.dll from the list”?

You’re not alone. This error typically occurs when your Windows Security (formerly Windows Defender) mistakenly quarantines essential game files, thinking they’re threats. The good news? This problem is easy to fix, and you can be back in-game in just a few minutes.

This guide walks you through a step-by-step method to fix this error, restore your quarantined game file, and prevent it from being blocked again.

🔧 What Causes the “Failed to Load Custom.dll” Error?

When you download and install games from unofficial or lesser-known sources, Windows Security can flag certain .dll (Dynamic Link Library) files as suspicious. These files are often critical for launching or running the game. Once flagged, Windows quarantines or deletes them, causing your game to throw this error.

✅ How to Fix It – Step-by-Step

Step 1: Open Windows Security

  1. Click the Search bar on your taskbar.

  2. Type Windows Security and open the app.

Step 2: Check Protection History

  1. Inside Windows Security, click on Virus & threat protection.

  2. Scroll down and click Protection history.

  3. Look for any recent threats or blocked items that mention your game or .dll files.

  4. Click the dropdown arrow next to the flagged item.

Step 3: Restore the Quarantined File

  1. Click Actions.

  2. Select Restore to recover the quarantined file related to the game Schedule I.

⚠️ Make sure the file you’re restoring is from a safe source. Restoring suspicious files from unknown games can be risky.

Step 4: Add the File as an Exclusion

This prevents Windows from flagging the same file again in the future.

  1. Go back to Virus & threat protection.

  2. Scroll down and click Manage settings under “Virus & threat protection settings.”

  3. Scroll down to Exclusions and click Add or remove exclusions.

  4. Click Add an exclusion, then choose File.

  5. Navigate to the folder where your game is installed.

  6. Select the .dll file or game executable that was previously blocked.

🎮 Launch the Game

Now that you’ve restored the blocked file and added it to the exclusion list, launch Schedule I again. You should be able to play without any errors.

🔒 Is It Safe to Restore DLL Files?

Yes—if the game is downloaded from a trusted source. False positives happen often with indie games or games not recognized by Windows Security. Always double-check the source before restoring any quarantined file.

📝 Final Thoughts

If you’re receiving the “Failed to load custom.dll from the list” error when launching Schedule I, don’t panic. Windows Security is simply trying to protect your PC, but it sometimes goes too far. By following the steps above, you can restore your file and get back to gaming.

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