For a long time I had a single runtime, but it got huge. Also, trying to find content if installed by default path/file structure is a nightmare... how can I remember what developer X made 3 years ago? I renamed EVERY folder so I could find it and trace it (ie, go to textures/locations/home one will take me to the textures for that product, rather than trying to remember it was made by Maclean. The problem with that is if you want to transfer morphs with the available commercial products; they all read the internal files, look for the geometry and if the path isn't right it won't work.

What I have now is a small collection of runtimes; V4A4, M4H4, Gen 3, Locations and the default runtime from Poser itself. All the content that spreads across multiple characters (like clothes for V4 AND A3) go in the default poser runtime. All the stuff I don't use much (toons, K4) are all in the default Poser runtime). I still rename the folders, but only the folders in the Character folder of each runtime. If I need to find geometry or textures now I open the cr2 file and read it in wordpad.

As to thumbnails, I have P3DO explorer. Really good for that and a lot of other stuff as well.