The following list describes some of the caveats and recommendations when modifying VIs and other files that ship with LabVIEW:
Make a copy of the shipping file and save it in another directory before making changes.
Do not save your own VIs or other files in .llb files installed with LabVIEW in the labview\vi.lib directory because LabVIEW uninstalls the .llb files, including any VIs and other files you saved in the .llb files, when you uninstall or reinstall.