TextureEnder

With the release of Minecraft Development Snapshot 13w24a, the game's Texture Pack system was replaced by the new Resource Pack system. Like unstitcher.jar for 1.5, Dinnerbone released a new tool called TextureEnder.jar. This can be downloaded from mojang.com under Snapshot 13w24a. Due to modding, most people have programs such as WinRar or 7-Zip associated with the file type .jar. Trying to run the TextureEnder.jar with 7-Zip or Winrar does appear like the minecraft.jar, although it meant to be run by the Java Platform SE Binary. In Windows, right click the file, and click open with\Java(TM) Platform SE binary. This will open it up as a program. Browse and find the texture pack you want to convert, and hit Convert Packs. This will automatically convert the pack for you.