Powershell to register a dll without regsvr32.exe

RegisterDLL.ps1

$registerDLL = @"
namespace RegisterDLL {
using System;
using System.Runtime.InteropServices;

    public static class Kernel32 {
        [DllImport("kernel32", SetLastError=true, CharSet = CharSet.Ansi)]
        public static extern IntPtr LoadLibrary([MarshalAs(UnmanagedType.LPStr)]string lpFileName); 

        [DllImport("kernel32", CharSet=CharSet.Ansi, ExactSpelling=true, SetLastError=true)]
        public static extern IntPtr GetProcAddress(IntPtr hModule, string procName);

        [DllImport("kernel32.dll", SetLastError=true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool FreeLibrary(IntPtr hModule);
    }
    
    public static class User32 {
        //[DllImport("user32.dll")]
        //public static extern IntPtr CallWindowProc(WndProcDelegate lpPrevWndFunc, IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
        [DllImport("user32.dll")]
        public static extern IntPtr CallWindowProc(IntPtr wndProc, IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);
    }
}
"@

Add-Type -TypeDefinition $registerDLL 

$dllPath = "C:\Full\Path\To.dll"
[System.IntPtr]$module = [RegisterDLL.Kernel32]::LoadLibrary($dllPath)
Write-Verbose "module = $module"

if(Test-Path -LiteralPath $dllPath)
{
    Write-Verbose "Found $dllPath, attempting to register"
    try
    {
        [System.IntPtr]$address = [RegisterDLL.Kernel32]::GetProcAddress($module, "DllRegisterServer")
        write-Verbose "address = $address"
        $finalResult = [RegisterDLL.User32]::CallWindowProc($address, $(Get-Process -Name powershell).Handle, 0, 0, 0)
        write-Verbose "finalResult = $finalResult"
    }
    finally
    {
        [RegisterDLL.Kernel32]::FreeLibrary($module) | Out-Null
    }
    

}
else
{
    Write-Verbose "Failed to find $dllPath"
}