VIT File Extension

'Vit' is the acronym and file type for LabVIEW Templates. Templates are patterns or models, used as starting points to create a new instance (copy) of that template. This new instance can either be used to perform some work in several instances (Think of communication using different channels or driving different devices.) or can be modified in order to not start on scratch but with some similar code.
The latter use case is available with the 'File/New' command. This offers to create a new VI from one of several templates. There are templates for Data Acquisition [ DAQ ], several Frameworks and Design Patterns and some Tutorial templates.