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Some users feel comfortable to view files with extensions. Problem arises when the files extension is not shown with the file name. Therefore, I have mentioned three ways to show a file extension. First, you need to know that what is a file extension. It is a group of letters after a file name, which indicates the nature of file. To show the file extension, you need to optimize registry. In addition, you need to clean Windows registry with the help of free registry cleaner such as "Registry Recycler"(You can Download it from RegistryRecycler.Com).