The .u3p file extension is most commonly associated with U3 Smart Drive software. U3 Smart Drives are a type of USB flash drive that lets a user run an application from the flash drive rather than the hard drive of the computer. The U3P files are the portable software that is stored on the U3 Smart Drive.
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If you have additional information about the U3P file format or software that uses files with the U3P suffix, please do get in touch - we would love hearing from you.