diff --git a/main_form.cs b/main_form.cs
index be8de73..18edfed 100644
--- a/main_form.cs
+++ b/main_form.cs
@@ -61,7 +61,7 @@ namespace KRY_0x02
             using (OpenFileDialog dlg = new OpenFileDialog())
             {
                 dlg.Title = "pick a pic";
-                dlg.Filter = "png (*.png)|*.png";
+                dlg.Filter = "png (*.png)|*.png|bmp (*.bmp)|*.bmp|tiff (*.tiff)|*.tiff";
 
                 if (dlg.ShowDialog() == DialogResult.OK)
                 {