A file name extension is a set of characters added to the end of a file name - normally after a full stop '.' with 3 x characters such as '.doc'. This determines which program, or application, should open it.
Follow these steps to choose whether Windows displays these file extensions.
In Microsoft Windows Vista or 7:
In Microsoft Windows 10
- Open Folder Options by clicking the Start button, clicking Control Panel, clicking Appearance and Personalization, and then clicking Folder Options.
- Click the View tab, and then, under Advanced settings, do one of the following:
- To hide file extensions, select the Hide extensions for known file types check box, and then click OK.
- To display file extensions, clear the Hide extensions for known file types check box, and then click OK.
- Open Folder Options by clicking the Start button and clicking File Explorer.
- Go to the folder with the files you would like to show the extension.
- Click the View tab :
- To unhide file extensions, tick File name extensions.
- To hide file extensions, untick File name extensions.
File extensions in Windows 10