What if you encounter the problem where Schedule I failed to load custom.dll from the list with the error code 126? Now read this post from MiniTool to learn the underlying reasons and targeted solutions.
Schedule I Failed to Load Custom.dll From the List – Error Code 126
“Error code 126 failed to load custom.dll from the list. Does anyone know how to fix error code 126? I just got it for some reason and I tried extracting and then starting the game, not extracting. Start the game paste the custom.dll into the folder and extract the game into another empty folder. The game worked before but when I updated the game nothing worked. The game name is Schedule I.”reddit.com
Schedule I is a video game in early access on Steam, released on March 24, 2025. The game features a multiplayer cooperative mode and a lighthearted and humorous cartoon visual style, which has attracted many players who are interested in open-world simulation games. However, some users are still unable to play the game and encounter the error message “Schedule I failed to load custom.dll from the list” when attempting to launch it. Are you one of them?
Why does this error occur?
This error indicates that the custom.dll file may not have been installed correctly or may have been deleted, causing the game program to be unable to locate it. Based on user feedback, this issue is often linked to your antivirus software. To be more specific, the antivirus program mistakenly identifies the custom.dll file as a threat and deletes it.
How can you fix the Schedule I error code 126? Follow the instructions below.
How to Fix Schedule I Failed to Load Custom.dll Error Code 126
Solution 1. Turn off Antivirus Real-time Protection and Restore the DLL File
To prevent your antivirus from deleting the custom.dll file and causing the error code 126, you can turn off the real-time protection. After that, you can restore the custom.dll file from the quarantined items folder or redo the game file extraction. Here I take Windows Defender to show you the steps.
How to turn off the real-time protection:
Step 1. Press Windows + I on your keyboard to open Settings.
Step 2. Navigate to Update & Security > Windows Security > Virus & threat protection.
Step 3. Under the Virus & threat protection settings section, click Manage settings.
Step 4. In the new window, switch the button of Real-time protection to Off.
How to restore the deleted custom.dll file:
You can check if the custom.dll file is in the Quarantined Items folder first. If yes, you can restore it.
Step 1. Go to the Virus & threat protection window in Windows Defender, and then hit Protection history.
Step 2. Select Quarantined Items from the Filters drop-down menu.
Step 3. Check if the custom.dll file is here. If yes, click it, and click Actions > Restore.
If you cannot find the custom.dll file in the Quarantined Items folder, you can use MiniTool Power Data Recovery to recover it. This Windows data recovery tool is capable of recovering DLL files and other types of data, including saved game files, documents, videos, photos, audio, emails, archives, and so on.
You can use the free edition to recover 1 GB of files for free.
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Solution 2. Exclude the Game Folder From Antivirus
If you want to keep your system secure and prefer not to disable real-time protection, you can instead add the Schedule I game folder to your antivirus whitelist. This will prevent the antivirus from scanning or mistakenly deleting the custom.dll file or other game files.
Step 1. Open the Virus & threat protection page and click Manage settings under Virus & threat protection settings.
Step 2. Scroll down to click Add or remove exclusions under Exclusions.
Step 3. Click Add an exclusion > Folder, and then select the Schedule I folder.
After that, you can relaunch the game and check if the problem of Schedule I failed to load custom.dll from the list is fixed.
Bottom Line
How to fix the Schedule I failed to load custom.dll error code 126 on Windows? Simply disable the real-time protection of your antivirus or add the game folder to the antivirus exclusion list. Hope the information above can help you.
About The Author
Position: Columnist
Shirley graduated from English major and is currently an editor of MiniTool Team. She likes browsing and writing IT-related articles, and is committed to becoming a professional IT problem solver. The topic of her articles are generally about data recovery, data backup, and computer disk management, as well as other IT issues. In spare time, she likes watching movies, hiking and fishing.
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