I believe, based on the picture, that an "archivador" is a "binder"--sometimes more specifically referred to as a plastic, 3-ring binder. But it may also refer to other kinds of organizers like a "file box" or a "file cabinet" "Carpeta" would be a folder. We can also refer to folders as "file folders" or even just "files" when we group them together like in a "file cabinet." Hope that helps : )

What Aline said. The "archivador" looks like a "3-ring binder," and the "carpeta" a "file folder," or more generically a "folder." We also use the generic word "notebooks" to refer to 3-ring binders. If we want to be specific, such as if I specifically needed a 3-ring binder for school, I would say (for example), "I need to go buy a 3-ring binder at the store." But otherwise, we are often more general. Like I would say, "I'm writing in my notebook," or "I like the cover of your notebook!"