A powershell function which adds a path to environment variable "Path", for those who hate Windows environment variable editor and its 2047 character limit.

Add-EnvironmentPath.ps1

function Add-EnvironmentPath {
    [OutputType([void])]
    [CmdletBinding()]
    param (
        [Parameter(Position = 0, Mandatory = $true, ValueFromPipeline = $true)]
        [ValidateScript({ Test-Path $_ -PathType Container }, ErrorMessage = 'Invalid path.')] 
        [string]$Path,
        [EnvironmentVariableTarget]$Target = [EnvironmentVariableTarget]::Machine,
        [switch]$Beginning
    )
    $oldPath = [Environment]::GetEnvironmentVariable("Path", $Target)
    $newPath = if (!$Beginning) {
        "$oldPath;$Path"
    }
    else {
        "$Path;$oldPath"
    }
    [Environment]::SetEnvironmentVariable("Path", $newPath, $Target)
}