Windows Sandbox is a feature introduced with Windows 10 Version 1903 feature updates that allows users to run separate operating system instances so that applications and services can be safely tested. It’s like a virtual machine that comes with a Windows 10 system, the system runs independently in a sandbox, all system files are protected, and all changes are automatically reset when the application is closed.
It has to be said that Windows Sandbox addresses the needs of many users for a security test environment and reduces the need to deploy applications such as VirtualBox. However, Microsoft recently admitted that a recent cumulative update has resulted in startup errors in Windows Sandbox and Windows Defender Guard (WDAG).
It is important to note that the currently affected feature update versions are included.
Windows 10 Pro, version 1903.
Windows 10 Enterprise, version 1903.
Windows 10 Pro, version 1909.
Windows 10 Enterprise, version 1909.
Windows 10 Pro, version 2004.
Windows 10 Enterprise, version 2004.
This error is present for feature updates, including Windows 10 May 2020 (20H1/Version 2004). A Microsoft official support document shows that users may experience an error alert of “ERROR_VSMB_SAVED_STATE_FILE_NOT_FOUND (0xC0370400) or “E_PATHNOTFOUND (0x80070003)” after running Windows Sandbox.
Microsoft says the current temporary solution is simple: restart the computer. “If you receive any of these error notifications, you need to restart your device to mitigate this problem,” Microsoft said. Microsoft said it was working on a fix, but did not provide a specific launch date.