If the classic viewer isn't showing up in your "Open with" list, you can restore it using these methods: :
: If the option is entirely missing, you may need to run a registry script to re-enable the file associations. This method is common for clean installs of newer Windows versions but also works for 8.1. Portable Alternatives for Windows 8.1 microsoft photo viewer download for windows 81 portable
Since the official Microsoft tool is a system component, there is no official "portable" version you can carry on a USB drive. If you need a truly portable image viewer that runs without installation, consider these high-quality alternatives: If the classic viewer isn't showing up in
Under "Photo viewer," click the current app and select from the list. If you need a truly portable image viewer
On Windows 8.1, the "Photos" app is often the default, but the classic is still present. It is preferred by many because it uses less memory and offers a cleaner interface. How to Enable or Restore Windows Photo Viewer