Calculator app and Microsoft Store won't open, appear to not exist

[Felix Hicks]

For no apparent reason, my calculator won't open, and instead gives a "This app can't open" error. While trying to troubleshoot it, I realised that the Microsoft Store has a similar problem - clicking on the app from the start menu does nothing, and trying to open it through a link gives the error "This file does not have an app associated with it for performing this action." Both apps appear greyed out in my Apps & Features menu, and as far as I can see they are the only two with issues.I have done some troubleshooting myself - resetting them from Apps & Features did nothing, and tryi

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