Sort of virtual directory

[Newbie]

Hey, I'm a little new to this world, but have at task that need to be fixed very soon ..
Here's the problem: I've made a site, where the users are accessing different virtual directory's (containing lots of files). The problem is that the file lists should show the newest first (as the setting are on the folder) but thats not happening, actually the newest file is at the bottom ....? The way I access the virtual directory's is simply the URL

Hope somebody might understand this and be able to hel

Thanks in advanc
Henrik