Cannot edit window and taskbar icons using resource packs

Since I don't like the workbench as the minecraft icon, I tried to use a resource pack to change it. I made a folder in the resource packs folder named "Icon Fix". Inside it contained the pack.png and pack.mcmeta from the 1.6.1.jar. Also, there was an "assets" folder that contained a "minecraft" folder that contained the "icons" folder. In the "icons" folder, I added an "icon_16x16.png" and "icon_32x32.png" to change the icons used in the window and on the taskbar. The "icon_16x16.png" was 16x16 and the "icon_32x32" was 32x32. I do not understand why it did not work. The resource pack I made is attached in a zipped folder.