i am on win 2000 reomting into aix unix server, i need to copy a file from
/tmp to my win 200 desktop, can anyone help with the command i need to use.

also, if a want to view a file in this directory how do i open it?

check if you can ftp to that remote server from your 2000 desktop

no i cant ftp.

basically i was told i was to sftp it from the server to my desktop.

i have used the get command to fetch the file, but im not sure where it is going and how to put it on my desktop.

Which software you're using to connect to the AIX box ? I suggest that you install WinSCP or pscp, connect to AIX, and tell the software where to download the file. If you are logged with ssh session to AIX, you can use command "cat" like "cat the-file", thus seeing the content.