How to Force Windows 10 to Display File Extensions in File Explorer
1 – Press the Windows+E key combination to launch File Explorer.
2 – Select the View tab.
3 – Click Options (located at the top right-hand side of the window).
4 – Click Change folder and search options.
5 – Select the View tab.
6 – Uncheck the box beside Hide extensions for known file types.
7 – Click Apply, then click Ok.