LabVIEW Project Library
A LabVIEW Project Library is a file with extension, *.lvlib. It is an XML file that stores information about the files owned by the library. The Project Explorer is used to view and edit these files. It is not recommended to edit the XML directly.
A LabVIEW Project Library is different than the LabVIEW Library that has the extension, *.llb. LabVIEW Libraries are single files on disk that contain other files in it; whereas the LabVIEW Project Library does not contain the files it owns. Its files exist separately on disk.