diff --git a/Base/res/icons/themes/Cupertino/16x16/window-close-modified-hover.jpg b/Base/res/icons/themes/Cupertino/16x16/window-close-modified-hover.png
similarity index 100%
rename from Base/res/icons/themes/Cupertino/16x16/window-close-modified-hover.jpg
rename to Base/res/icons/themes/Cupertino/16x16/window-close-modified-hover.png