Once activated, right-click any image (like a .jpg or .png ), select , choose Windows Photo Viewer , and check the box that says "Use this app for all files." Method 2: Create Your Own "Portable" Shortcut Script
If you prefer a truly portable, single-file experience without touching the Registry, the community almost universally points to these favorites: microsoft photo viewer download for windows 81 portable
Windows Registry Editor Version 5.00