Installer Failed with `options.env has an invalid environment variable name: "CommonProgramFiles(x86)`

[Bhuvaneswari203]

downloading .NET version(s) 10.0.201-globalx64 .....
Error : (DotnetAcquisitionFinalError)
Failed to download .NET 10.0.201-globalx64:
An error was raised by the .NET SDK installer. The exit code it gave us: options.env has an invalid environment variable name: "CommonProgramFiles(x86)".

[nagilson]

seems like this also manifests differently:
#2630