How to show file extensions in Windows

There are several ways to make the Windows Explorer show full file extensions. The most consistent method I like to use is the following:

Windows 7 and 8

1. click Start to find a Search Box
2. type Folder Options and select it
3. click the View Tab
4. find the option “hide extensions for known file types”
5. untick it and hit apply

Windows 10

1. click Start to find a Search Box
2. type File Explorer Options and select it
3. select the View Tab
4. find the option “hide extensions for known file types”
5. untick it and hit apply