On both Windows 10 and 11 PCs, Microsoft Photos is the default app for opening JPG files. So, if there's a problem with this app, it may fail to open any JPG files.

Do you want to know how to open WebP images on Windows? Here are the 5 best ways to do it! And yes, most of these are free solutions!

The problem is that with some windows 10 PCs on my network can scroll through image files (using the arrow keys to move to next or previous photo for example) on my Synology DS 418play NAS with ...

You can convert a WEBP file to JPG using built-in apps on a Mac or Windows PC, or a third-party service.

You can convert a JFIF file to JPG, though the two formats are nearly identical, and most software will open a JFIF file as a JPG.