When you press F2 to rename a file it highlights the entire file including the extension? That is odd because since Windows 7 it has been set to NOT include the extension when the file gets renamed, they did this because some users would rename a file and then it would not open as file extensions are how Windows associates what to open a file with. There are many people asking for what yours is apparently doing and selecting the entire filename in the highlight. So far I have seen no way to change this behavior, no registry setting etc.. odd that yours is doing that which some users want.