This can be done from a Search window, transfer window and in chatrooms.
Simply right click the users name : and click Browse.
If you are doing this in a search or transfer window and do not have duplicate results expanded by default, (to verify see image below Settings, Search ,Results Display )
You can either change this setting to expanded by default, but be aware that this can clutter WinMX or you can manually expand by Clicking the + sign to the left. .
This is very useful in chatrooms. Which can be a varied and useful source of uncorrupted files.