Organizing files is a very simple process in Poser. Regardless of Mac or Windows, you simply follow the directory structures you want for your "Libraries" folder.  NOTE, in order for files to load textures properly and geometries, those structures should be left as-is inside the Runtime for that package you downloaded and installed. You can play around with the directory structure of your "Libraries" folder though, so long as you do so inside the sub-folders like "Runtime > Libraries > Pose" There you can make folders such as "V4", "M4" or whatever and organize however you want it.

In general terms I have hundreds of files I work with and also custom made character, textures, etc. So, I make a figure specific folder inside each category like "Pose > V4" then drill down with directories like "Clothing", "Hair", etc. that way I know at a glance to find the figure I am working with (like V4) then what items I want (like hair, pose, etc.)

Hope that helps some.

Jeff

Development on: Mac Pro 2008, Duel-Boot OS - Snow Leopard 10.6.6 & Windows 7 Ultimate 64bit, 2 x 2.8 GHz Quad-Core Intel Xeon , 10GB 800 MHz DDR2 RAM, NVIDIA GeForce 8800GT.