Private Sub ExtractRezFile(ByVal FileName As String) Dim extraction As New RezLib.ExtractThread With { _ .FileName = FileName _ } Dim start As New Threading.Thread(AddressOf extraction.Extract) start.Start() End Sub Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click ExtractRezFile("REZ FILE PATH") End Sub