lol ... I had that before following your logic. However my menu doesn't get full and Gnome Commander root is not added to the menu even after a brisk lxpanelctl restart.
I was kidding about the full menu. Here it is again. This is a verbatim copy.
Name=GNOME Commander root
All I can suggest is to rename your old desktop file. Copy and paste what's shown here. Save it as the new desktop file.