FastStone offers an interface closely aligned with traditional Windows design languages. It features an innovative full-screen mode that reveals hidden tool panels when you mouse over the edges of your screen.
If you absolutely must download a portable image viewer from a third-party source:
Since a portable version of the official Microsoft viewer does not exist, the following third-party applications are the standard recommendations for users needing a "no-install" solution that runs from a USB stick: Microsoft Photos - Free download and install on Windows microsoft photo viewer download for windows 81 portable
Microsoft introduced a major change in Windows 8 and 8.1 by replacing the classic with a new, touch-centric “Photos” app . Many users found the modern app slower, less intuitive for mouse-and-keyboard workflows, and lacking certain simple features (like the ability to view GIFs or easily zoom with the mouse wheel).
When Microsoft introduced Windows 8, they also introduced the modern “Photos” app as a functional replacement for the classic Windows Photo Viewer and Windows Photo Gallery. While the classic viewer remained present in Windows 8.1, Microsoft made the conscious decision not to offer it as a separate installer or portable package. Many users found the modern app slower, less
Because Microsoft never created an official standalone installer package for this tool, these third-party packages are often bundles containing adware, malware, or registry-corrupting scripts. Stick to unlocking the native system file using the registry method outlined above, or use trusted, open-source portable apps like IrfanView or XnView. Summary: Which Method Should You Choose?
However, the community has created a variety of excellent portable image viewers that can serve the same purpose—often with more features and better format support than Microsoft Photo Viewer. It features a clean layout
to restore it to your "Open with" menu and default apps list. 2. Best Portable Alternatives for Windows 8.1
If you strictly need a standalone executable file that runs from a USB flash drive without modifying the host computer's registry, the built-in Windows DLL trick won’t perfectly solve your problem. Instead, you should look at lightweight, open-source, or freeware portable image viewers that exactly replicate or improve upon the classic Microsoft experience.
Standard window controls, easy zoom scrolling, and a clean toolbar.
It features a clean layout, tabbed browsing for multiple images, and an excellent folder navigation tree.