Sometimes Windows Explorer will hide file associations that deal with common file types such as .ZIP, .WAV (sound) and .JPG (graphics). When this happens, you can open Explorer as above, click on ...

Alternatively, right-click the file and select "Rename." Press "Ctrl-A" if you also need to copy the file extension. This requires the previous unchecking of "Hide Extensions for Known File Types." ...

FileTypesMan allows you to view, add, remove edit file extensions and types on Windows 11/10. You can always manually set or change File Associations & Extensions.

The two stand out because they are also common file extension names. The former, .zip, is ubiquitous for data compression, while .mov is a video format developed by Apple.