Fix Windows Sandbox error 0x80070003, 0xC0370400 in Windows 10

How to Fix Windows Sandbox error 0x80070003, 0xC0370400 code with ERROR_VSMB_SAVED_STATE_FILE_NOT_FOUND or E_PATHNOTFOUND in Windows 10.

Fix Windows Sandbox error 0x80070003, 0xC0370400 in Windows 10

Windows Sandbox is a great tool in Windows 10 but you might encounter errors on this app. Recently, the security app tool and Windows Defender Application Guard (WDAG) started showing an error on Windows 10 1903, 1909, 2004 versions. This is Windows Sandbox error 0x80070003 (0xC0370400) that may show up in your system when you open the app.

Windows Sandbox was put forward earlier in Windows 10 May 2019 update (v1903) for the Enterprise and Professional versions users. The feature added a new dimension in the arena of software testing and made it easier and harmless. App has an integrated virtual engine in order to test the untrusted software in a separate desktop environment to ensure the task is not hampering Windows 10. Any file used in Sandbox will be there in the environment and straight away deleted once you close the application.

Windows Sandbox error 0x80070003 (0xC0370400) in Windows 10

Here is how to Fix Windows Sandbox error 0x80070003 (0xC0370400) in Windows 10 –

You can open the Windows Sandbox using below guidelines –

  • Press the Windows key.
  • Type Sandbox.
  • Select “Windows Sandbox” under Best match.

If Windows Sandbox error 0x80070003 (0xC0370400) usually appears when you try to launch the app then the error message will be –


Simply restart your device and hopefully, the app will be working perfectly. In case the issue still occurs Microsoft is working on a resolution and you will get it through a future patch or build. Suppose you encounter other errors you can follow the solutions here – See – How to fix Windows 10 Sandbox Problems.

Note that the same error occurs with Symptom summary Windows Defender Application Guard (WDAG) and the workaround to fix the issue is also the same.

1] How to Activate Windows Sandbox in the Home Version of Windows 10
2] How to Manage Sandbox in Windows 10
3] How to Turn on Windows Defender Sandbox in Windows 10

Source – Microsoft Support

That’s all!!!

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Topics:  Windows
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Windows 11, 10 Tweaker, and Tech Enthusiast.