VI is a bitmap format also known as Jovian Logic VI. It is a video capture board format, most likely storing images that were taken with a camera, camcorder or tape deck that was later on linked to a computer for editing. VI is considered a rare and obsolete format and it is difficult to open using regular image viewers.
The quick and simple way to handle your files is to get a quality piece of software, such as reaConverter. This software is extremely efficient in managing a wide range of batch conversions. As you will soon realize, reaConverter will help you avoid spending countless hours trying to figure out how to convert multiple VI files as once.
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