Originally published at: http://www.howtogeek.com/tips/how-to-make-a-portable-application-the-default-file-handler-in-windows-8/
The PortableApps platform is great. It allows you to carry around a bunch of programs on a USB drive and even has its own “Start Menu” that runs in the notification tray. One thing it did lack however, was a feature that allows you to associate file types with a portable application while your USB stick was plugged into a PC.
Hello! I think this is not necessary. You can associate an extension to a portable app with only the contextual menu / open with / cheking the "always...." box. I did that with several extensions, for instance with .avi files and vlc portable.