LVLIB File Extension
The LVLIB File Extension (*.lvlib), or LabVIEW Project Library, are collections of VIs, type definitions, shared variables, palette files, and other files, including other project libraries. When you create and save a new project library, LabVIEW creates a project library file (.lvlib), which includes the properties of the project library and the references to files that the project library owns. Do not confused with LabVIEW Libraries (*.llb). See LabVIEW Project Library.
In LabVIEW 2025 Q1, the NI_IconEditor property's name changed to NI.Lib.VIIconTemplate to reflect its meaning better. (It stores the template layer icon.)