Environment variables in PowerShell with a dot (.) in the name

Use the .NET method to get the variable:

[Environment]::GetEnvironmentVariable("FOO.BAR")

To access any kind of PowerShell variable where the name contains non-alphanumeric characters, use the ${…} notation as in:

${env:variable.with.dots} = "Hi there"
${env:variable.with.dots}

This works for variables in any drive (registry, filesystem, etc.)

Use:

Get-WMIObject Win32_Environment -filter "name='foo.bar'"

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