winutil/functions/private/Invoke-WinUtilExplorerRefresh.ps1

function Invoke-WinUtilExplorerRefresh {
    <#
    .SYNOPSIS
        Refreshes the Windows Explorer
    #>

    Invoke-WPFRunspace -DebugPreference $DebugPreference -ScriptBlock {
        # Send the WM_SETTINGCHANGE message to all windows
        Add-Type -TypeDefinition @"
using System;
using System.Runtime.InteropServices;
public class Win32 {
    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = false)]
    public static extern IntPtr SendMessageTimeout(
        IntPtr hWnd,
        uint Msg,
        IntPtr wParam,
        string lParam,
        uint fuFlags,
        uint uTimeout,
        out IntPtr lpdwResult);
}
"@

        $HWND_BROADCAST = [IntPtr]0xffff
        $WM_SETTINGCHANGE = 0x1A
        $SMTO_ABORTIFHUNG = 0x2
        $timeout = 100

        # Send the broadcast message to all windows
        [Win32]::SendMessageTimeout($HWND_BROADCAST, $WM_SETTINGCHANGE, [IntPtr]::Zero, "ImmersiveColorSet", $SMTO_ABORTIFHUNG, $timeout, [ref]([IntPtr]::Zero))
    }
}