Web design and site structure question.

I have 3 web pages written in ASP.NET

My web site structure is:

Code:

---

WokasWebSite
  -> Login.aspx
  -> Main.aspx
  -> Download.aspx

---

I have forms authentication on, and if you don't log in then you keep getting redirected to the login page when attempting to view the others. That's not related to this question, but I thought I'd give as much detail as possible.
Anyways, i have designed it like above. But why not design it like:

Code:

---

WokasWebSite
  \Login
      -> Index.aspx
  \Main
      -> Index.aspx
  \Download
      -> Index.aspx

---

\Login is the folder name within the virtual directory.
So the question is, when do you use the 1st design and when should you use the 2nd?

Woka