First off thanks in advance for any of you MS gurus with the time and expertise to help me with this--
I've unsuccessfully been trying to find the answer all over the net for QUITE a while and am officially pulling my hair out cause I can't find anything on topic.

To put it simply, the problem occurs when adding an attachment in Outlook, Outlook/Windows DOES NOT fill in the file NAME field with the names of the files that match the letters I type. Normally Windows is supposed to "suggest" all the files in the folder that have the same name as what you've typed, removing "suggestions" after they no longer match or after you click one of the choices given.  On my computer at home, Outlook does this effortlessly so I know it's supposed to work.  Heck... even AOL does this when you add an attachment.
 
But not Outlook on my work computer.
The operating system is an up to date  Windows XP Pro SP3 and the email client is Outlook 2003.
Outlook works just fine EXCEPT the problem described above. 
Specifically it happens when you go into Outlook to compose/reply to a message and then add and attachment and browse to get it.
At this point Windows does not give any spelling hints at all. I can still manually scroll through the folder until I find the name and double click to attach it, but the problem is that Windows isn't suggesting and giving file name options of files in the folder.
I can ALSO just drag the icon of the file into the outlook email window to attach it, so attachments work but not the name fill in.
This is problematic because I have a shared NETWORK FOLDER that has LITERALLY tens of thousands of files with very similar names and having to scroll through to find it is very painful and a waste of time.
I'm not sure if this is a windows problem or an outlook problem.

That said the auto-complete in the email field for the names and contacts is fine.
So UNLIKE 99% of people on the web, I'm not asking about fixing that since this part works great.

Can anybody help?
Or point me in the right direction with what function this is even called and how to better describe the problem?
Thanks again in advance