winutil/functions/private/ConvertTo-Icon.ps1

function ConvertTo-Icon {
    <#

        .DESCRIPTION
        This function will convert PNG to ICO file

        .EXAMPLE
        ConvertTo-Icon -bitmapPath "$env:TEMP\cttlogo.png" -iconPath $iconPath
    #>
    param( [Parameter(Mandatory=$true)]
        $bitmapPath,
        $iconPath = "$env:temp\newicon.ico"
    )

    Add-Type -AssemblyName System.Drawing

    if (Test-Path $bitmapPath) {
        $b = [System.Drawing.Bitmap]::FromFile($bitmapPath)
        $icon = [System.Drawing.Icon]::FromHandle($b.GetHicon())
        $file = New-Object System.IO.FileStream($iconPath, 'OpenOrCreate')
        $icon.Save($file)
        $file.Close()
        $icon.Dispose()
        #explorer "/SELECT,$iconpath"
    }
    else { Write-Warning "$BitmapPath does not exist" }
}