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Apps on Win 10 workstations suddenly saying .net v4.0.30319 needs to be installed

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We have several machines running windows 10 which have suddenly started displaying errors when opening dotnet apps which previously worked. Amongst these is MSTeams but several apps on the same machines have all stopped working at the same time, so its an issue with windows and not the application itself.When you open the application it displays a message indicating

This application requires one of the following versions of the .NET framework:V4.0.30319

Windows 10 comes with .net4 installed so you obviously can't just reinstall it.In c:\windows\Microsoft.NET\Framework64\ I have a v4.0.30319 folder with what appears to be a valid .net installation. I've compared the folder with other machines and it looks ok.

If I execute the following Powershell

Get-ChildItem 'HKLM:\SOFTWARE\Microsoft\NET Framework Setup\NDP' -Recurse | Get-ItemProperty -Name version -EA 0 | Where { $_.PSChildName -Match '^(?!S)\p{L}'} | Select PSChildName, version

it returns this:

    PSChildName                      Version-----------                      -------v2.0.50727                       2.0.50727.4927v3.0                             3.0.30729.4926Windows Communication Foundation 3.0.4506.4926Windows Presentation Foundation  3.0.6920.4902v3.5                             3.5.30729.4926Client                           4.8.09037Full                             4.8.09037Client                           4.0.0.0

which, again, seems to be ok. The 4.8 version number varies on other machines

so, it looks like something has been modified which stops .net version detection from working as it should.I've tried repairing via dism. KB5033910 is a CU for .net and win10 which I thought might reset things but apparently windows10.0-kb5033910-x64-ndp48_b1a3e722dbcd8d88b845314b8e9bf5e8fd9b6904.msu is not applicable to windows 10. Go figure.

Anyone seen this issue or know how .net is detected by apps compiled against .net?


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