While active, eXpresso allows the user to associate files to applications on a portable device (such as a USB flash drive), with a standard double click. No modifications will be made to the host system, all monitoring of file launches, all settings and all dependencies are contained in the eXpresso directory.
eXpresso is written in AutoHotKey, and uses a system double click hook to associate its files. It also has a SendTo convery feature.