Porphyrogenitus, I'm a new user like yourself and I had the same confusion. Let me see if I can make this easy. This is what I've found and how I've worked with it.

The new Daz3D Studio 4 has a new file structure. If you are using Windows 7 or Vista, you'll find the storage files in your My Documents folder. The path is:

C:usersusernameMy DocumentsDaz3DMy Library

In older versions and in Poser, My Library USED to be Content. With Runtime as one of it's subfolders. So:

Here's a common situation:

You have downloaded an older Poser or Daz3D based file from a 3d party site, (Renderosity, for example) for say V4, hair for instance, and it came in a .zip format.

When you unzip the file into a temp folder you'll see either a "content" folder or a "runtime" folder. If is says "content" you can mentally substitute the words "my library" which is the new folder in Daz3D 4 that has been renamed from the older "content" folder. All you need to do then is to open the "content" folder and copy the contents (not the folder itself) into your

C:usersusernameMy DocumentsDaz3dStudio folder. Ideally, the file structure is already set up and the files SHOULD go into the proper subfolders. Operative word here being, should.

It will ask you if you want to merge the data. You say yes. All of that content will show up, in the program, under the Poser files not Daz3D.

If you copy the folder itself to that directory, you'll wind up with a "contents" subfolder which shouldn't be there. If there one already, open it and move the contents to the parent directory "My Library."

If you see a 'Runtime" folder, all you need to do is copy that to your

C:usersusernameMy DocumentsDaz3dStudioMy Library folder because Runtime is a subfolder of My Library. That content, also, will show up in the program as Poser files.

Here's where the difficulty comes in, especially with hair files. Sometimes there are three parts, the cap, the hair itself and the textures. Unfortunately, they all show up in different areas. The cap will usually show up under the Props tab for some gawdawful reason. Hair SHOULD show up either in the Hair tab or Poses tab. Why hair shows up in Poses is completely beyond me, but it does. Or it could show up a s a subfolder of V4 which is in the People tab. This is where most of the confusion is, because apparently, different creators use different file structures in their archives.

And you'll probably find the textures either in Poses again, or in Materials. Or even possibly as a subfolder of V4.

The problem isn't necessarily wth either Poser or Daz3d. Often, it's the creator of the custom content that determines where it shows up by the file structure they used when it was made.

IF you want to take the time, you CAN, using Content Manager, assign each piece of custom content to a category and use that tab which will make finding items you use a lot, much simpler.

If my explanation is incorrect, I welcome any of you veterans to correct me.  Or to point me to a more effective filing system.

(this is weird, apparently this editor doesn't like the backslash.)