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Have MSBuild/nmake available in PowerShell

The following guide will modify all new PowerShell instances to run the required preparations to invoke MSBuild/nmake.

Open (or create) the profile file "$((new-object -COM Shell.Application).Namespace(0x05).Self.Path)\WindowsPowerShell\Microsoft.PowerShell_profile.ps1" and add the following content:

function Invoke-CmdScript {
    [String] $scriptName
  $cmdLine = """$scriptName"" $args & set"
  & $Env:SystemRoot\system32\cmd.exe /c $cmdLine |
  select-string '^([^=]*)=(.*)$' | foreach-object {
    $varName = $_.Matches[0].Groups[1].Value
    $varValue = $_.Matches[0].Groups[2].Value
    set-item Env:$varName $varValue

Invoke-CmdScript "C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\VC\Auxiliary\Build\vcvarsall.bat" x64

Replace the Visual Studio version in the path with your installed version and you're good to go!