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How To Fix Diablo 4 Unable To Open Critical File Error

Diablo 4, the highly anticipated action role-playing game, has captured the hearts of gamers worldwide. But some players have run into a frustrating problem: the “unable to open a critical file” error. 

This error stops them from starting up and enjoying the Game, especially if they are using the Xbox Game Pass. Fear not, as there are solutions to overcome this obstacle.

The Root Cause

The “unable to open a critical file” error in Diablo 4 is primarily related to pending game updates. The way Microsoft updates and shares games through the Xbox Game Pass is different from other platforms. This difference can sometimes lead to conflicts, resulting in the inability to open critical files required for the game to run smoothly.

Solution 1: Update Through Battle.net

One effective solution is to update Diablo 4 through the Battle.net launcher. Follow these steps:

  1. Close both the Xbox app and the Battle.net launcher.
  2. Reopen only the Battle.net launcher.
  3. Navigate to the Diablo 4 section and check for any available updates.
  4. If updates are available, initiate the download process.
  5. Once the updates are installed, relaunch the Xbox app.
  6. By updating Diablo 4 through Battle.net, you ensure that both platforms recognize the latest game files, potentially resolving the critical file issue.

Solution 2: Delete and Reinstall Battle.net Files

If the first solution does not work, try deleting the Battle.net files and reinstalling them. Here’s how:

  1. Close all Battle.net-related processes using the Task Manager.
  2. Press the Windows Key + R, type “C:\ProgramData”, and press Enter.
  3. Locate the Battle.net folder and delete it.
  4. Reopen the Battle.net launcher and check for Diablo 4 updates.
  5. Install any available updates.
  6. Deleting the Battle.net folder removes any potentially corrupt files that could be causing the issue, allowing you to start fresh with the latest game files.

Additional Tips

To ensure a smooth Diablo 4 experience, consider the following tips:

  • Check for updates frequently: Updating your game can avoid a great deal of issues.
  • Engage with the community: Telling others about your experience and getting advice from other players can enable you to develop insights and solutions.
  • Be patient: In case an issues persist, stay away from the game for a few days – some errors will fix themselves over time.


The “unable to open a critical file” error in Diablo 4 can be frustrating – but it can be fixed. You are able to correct this problem by carrying out the suggested fixes – like installing the game using the Battle.net launcher or reinstalling and uninstalling the Battle.net client files – and then go back to Sanctuary. 

Remember that always having the latest software, asking for help from the gaming community and generally being patient can help your gaming experience.

Written by
I am an award-winning professional Freelance Writer with over 2 years of experience writing for Content Creators and Companies. My work includes SEO, Copywriting, Blog Writing, Content Writing, and Scriptwriting. Also, I just love strategy, MOBA, and FPS games like Valorant, Total War, and League of Legends!

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