Functions/Update-ExplorerIcon.ps1

function Update-ExplorerIcon {
<#
.SYNOPSIS
    Updates Explorer icons
.DESCRIPTION
    Updates Explorer icons
.NOTES
    Source: https://community.idera.com/database-tools/powershell/powertips/b/tips/posts/refreshing-icon-cache
#>


    [CmdletBinding(ConfirmImpact='Low')]
    param()

    $code = @'
private static readonly IntPtr HWND_BROADCAST = new IntPtr(0xffff);
private const int WM_SETTINGCHANGE = 0x1a;
private const int SMTO_ABORTIFHUNG = 0x0002;
 
[System.Runtime.InteropServices.DllImport("user32.dll", SetLastError=true, CharSet=CharSet.Auto)]
 static extern bool SendNotifyMessage(IntPtr hWnd, uint Msg, UIntPtr wParam,
   IntPtr lParam);
 
[System.Runtime.InteropServices.DllImport("user32.dll", SetLastError = true)]
  private static extern IntPtr SendMessageTimeout ( IntPtr hWnd, int Msg, IntPtr wParam, string lParam, uint fuFlags, uint uTimeout, IntPtr lpdwResult );
 
[System.Runtime.InteropServices.DllImport("Shell32.dll")]
private static extern int SHChangeNotify(int eventId, int flags, IntPtr item1, IntPtr item2);
 
public static void Refresh() {
    SHChangeNotify(0x8000000, 0x1000, IntPtr.Zero, IntPtr.Zero);
    SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, IntPtr.Zero, null, SMTO_ABORTIFHUNG, 100, IntPtr.Zero);
}
'@


    Add-Type -MemberDefinition $code -Namespace MyWinAPI -Name Explorer
    [MyWinAPI.Explorer]::Refresh()

}