Finding Outlook.pst

I did a search for Outlook.pst, and the search engine found this:
C:\Documents and Settings\%username%\Local Settings\Application
Data\Microsoft\Outlook\

Questions:

1: when I try to find that path after %username% (using the actual name),
there is no Application Data\Microsoft\Outlook\ , so the only way to find the
Contacts file is to always do a search. How can I find the
Application Data\Microsoft\Outlook\ so I don't have to run a search?

2: My purpose in finding it was for backup purposes. So I ended up doing a
Copy/ Paste from my Search to my external backup. It seems to have worked,
but when I try to open the .pst file, I get a message that Windows can't open
the file. I wanted to open it in the backup to make sure I could access the
Contact list.

Any help would be appreciated