Learn how to show file types, or extensions (dot file types) in Windows Explorer or Save As Dialog Box. This shows the dot file types in Windows Explorer and in the Save As dialog box text boxed: “File name” and “Save as type”.
Show File Extensions in File Name Steps as seen in video:
1. Click Start Button,
2. Type "Control Panel"
3. Go to Control Panel
4. Go to File Explorer Options (some systems use "Folder Options")
5. Click View Tab
6. Uncheck "Hide extensions from known file types"

Show File Extensions (Types), the “Dot Part” in Windows Explorer and Save As Dialog Box.
My dot extensions do not show up when I save. My File Types are not showing when I save. How to show file types after I save. How to show file extensions in Windows.