Have you just downloaded a work PDF and suddenly found the file has the extension of a text file (TXT) or even no extension ...

Associating a file type with a program can be done in several ways, such as using the Open with dialog and selecting the Always use this app to open checkbox, or via Default Programs or Default Apps.

See Win Change Windows appearance ... Windows defaults to not showing the file type extensions at the end of the file name, but many people like to see them when viewing files in Explorer.

To change the network profile type using Registry Editor, do the following: Press Win+R to open the Run dialog. Click the OK button. Restart your computer. In the Profiles key, you may find ...