When Apple devices started using High-Efficiency Image Format for coding images it created another problem when these HEIC images were emailed to a Windows computer.  There are various paths that you can take to enable native HEIC support in Windows; even Windows says it’s easy to enable but sometimes it doesn’t work.  The best program weve found for opening HEIC images in Windows is CopyTrans HEIC for Windows

It’s free for personal use.