New-ExplorerContextMenuEntry.ps1

function New-ExplorerContextMenuEntry {
    param(
        $Identifier,
        $icon,
        $MenuText,
        $command,
        $Class
    )

    $OldLocation = Get-Location
    try {
        $Path = 'Registry::HKEY_CURRENT_USER\SOFTWARE\Classes\{0}' -f $Class
        Set-Location -LiteralPath $Path -ErrorAction Stop
    } catch {
        Write-Host "Failed to enter known key: $_"
        return
    }
    New-Item -ItemType Container -Name 'shell' | Out-Null
    New-Item -ItemType Container -Name $Identifier -Path '.\shell' | Out-Null
    New-Item -ItemType Container -Name 'command' -Path ".\shell\$Identifier" | Out-Null

    New-ItemProperty -Name 'icon' -Value $Icon -PropertyType 'ExpandString' -Path ".\shell\$Identifier" | Out-Null
    New-ItemProperty -Name '(Default)' -Value $MenuText -PropertyType 'ExpandString' -Path ".\shell\$Identifier" | Out-Null
    New-ItemProperty -Name '(Default)' -Value $command -PropertyType 'ExpandString' -Path ".\shell\$Identifier\command" | Out-Null

    Set-Location $OldLocation
}