Hey guys! I am trying to mod my Minecraft 1.6.2 with Optifine, as well as leave room to further mod. I have the latest version of optifine, and am using the latest version of minecraft forge as well. I have installed forge, and have verified that it works through the mod folder, but Optifine is a coremod, and must be put directly into the minecraft.jar for it to work. I put it in, and when I launched my game, it said that the .jar file was corrupt, and that I needed a new one. Any suggestions on how to install Optifine with forge? Thanks!