Failed to Open a Required File

Keywords: BLZAPPBTS0000F, BLZPTS0000F, BLZBNTBTS0000F, BLZBNTBTS00000047, BLZBNTBTS00000049, BLZBNTBTS0000004E, BLZBNTBTS00000050
Failed to open a required file. Please check your internet connection and try again.​
Errors: BLZBNTBTS00000035, BLZBNTBTS00000047, BLZBNTBTS00000049, BLZBNTBTS0000004E, BLZBNTBTS0000F, BLZBNTBTS00000050

This error occurs when one or more of your game files are corrupted and can’t be opened, which is usually caused by a bad disc or an unstable Internet connection. Follow the steps for your operating system to resolve the issue.

Windows

  1. If you receive this error while installing the game from the disc, remove the disc and download the game client instead.
  2. If you're using wireless internet, try switching to an optimized wired connection.
  3. Security software may interfere with the Battle.net Update Agent and prevent it from running properly. Disable or temporarily uninstall any security programs.
Advanced Troubleshooting
  1. Programs running in the background can conflict with the Battle.net Update Agent. Try closing background applications.
  2. You may experience errors when Battle.net Update Agent files are missing or corrupt. Delete the Battle.net Tools folder to have the Battle.net Update Agent automatically recreate necessary files.

Mac

  1. If you receive this error while installing the game from the disc, remove the disc and download the game client instead.
  2. If you're using wireless internet, try switching to an optimized wired connection.
  3. Security software may interfere with the Battle.net Update Agent and prevent it from running properly. Disable or temporarily uninstall any security programs.
Advanced Troubleshooting
  1. Programs running in the background can conflict with the Battle.net Update Agent. Try closing background applications.
  2. You may experience errors when Battle.net Update Agent files are missing or corrupt. Delete the Battle.net Tools folder to have the Update Agent automatically recreate necessary files.

Tried everything here?

If you have tried all of the steps for your operating system and still require assistance, please visit our Technical Support Forum (World of Warcraft) (StarCraft II) (Diablo III) (Hearthstone) or contact us.

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