User blog comment:Ireithien/Can someone please help?/@comment-4052371-20130810010045

"... there is no 1.6.2.jar file. Only ... an executable jar file called 1.6.2 ..."

Those two are exactly the same; Windows doesn't show file extensions by default. You have the right file all along. If the file's "Type" in Windows Explorer is "Executable Jar File", that means that it has a .jar extension. Right-click the file and hit properties, and it'll confirm that it is a .jar file. You should be able to install Optifine into the file you just mentioned.