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U3 is a USB flash storage app that lets you carry and run Microsoft Windows applications directly from the flash drive. For some people, this is a useful tool. However, it is also an extremely invasive piece of software that automatically installs itself on a Windows PC without asking permission or providing the option not to install as soon as you plug in the USB flash drive.U3 is a USB flash storage application that lets you carry and run Microsoft Windows applications directly from the flash drive. For some people, this is a useful tool. However, it is also an extremely invasive piece of software that automatically installs itself on a Windows PC without asking permission or providing the option not to install as soon as you plug in the USB flash drive.