In my first response to this thread I provided a link to another thread in which I posted a link to a tool available over at LAVA for finding used/unused VIs in a project.
Yes, but this tool list VI:s and files based on a main VI-path and search folders and files at disk, it does not list VI/files in a project file (*.lvproj) that could be different. Its not always you have all files from a folder in the project-file.