I'm missing my Lr catalog, when I searched for it and clicked the link I get a dialogue box that reads:
The driver or network connection that the shortcu'_T1A0006.JPG-2.lrcat.Ink' refers to is unavailable. Make sure the disk is properly inserted or the network resource is available, and then try again.
What you are trying to open is a Shortcut and not the real catalog file as it ends with a .lnk (LNK) extension.
Search your drives for .LRCAT (.lrcat) and see what comes up.