Why can I not open any .mbox folders?

If I go to my Home > Library > Mail and then try to open the INBOX.mbox or Sent Messages.mbox folders I can't. In fact the icon for these files is a document. When I double click on the xxxx.mbox I get a message saying there is no default application to open the xxxx.mbox.
I should be able to open the INBOX.mbox and see my emails saved as individual files, which can be read by TextEdit.
I'm not having any problems with Mail, I'm just curious to know what is going on. My hunch is that my emails and settings originally came from OS9 (Outlook Express) then 10.3 (Mail) and now 10.5 and maybe something has gone wrong during these transitions?
Thanks

Hello
Yes, I understand each mail account will have it's own Deleted, Draft, Inbox, Junk and Sent mailboxes. I also understand where my user created mailboxes are.
I have created a couple of new user created mailboxes. I can see them in my Home/Library/Mail/Mailboxes but even these new mailboxes can not be opened like a folder, my Mac is treating them like a document which can not be opened by any application (I've tried TextEdit and Word).
My hunch is...
Years ago I was using Outlook Express on OS 9. I then updated to OS 10.3 and Mail. I had big problems getting my email from Outlook into Mail and the new OS. I have recently upgraded to OS 10.5. My hunch is that something has gone wrong with this process and the new capabilities of Mail in OS 10.5 are not working i.e. in OS 10.3 emails were not saved as individual xxxx.emix files.
Mail is working fine, but I would feel a lot safer if the mailboxes were behaving as they should. The question is, what do I do?

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