I spotted a nice post from Chris on the SAS Dummy blog. Enterprise Guide 4.2 saw the introduction of a feature that allows you to view the details of your data sets (such as the data set labels, how many records the data sets contain, and more) while you browse the contents of a SAS library. You can see the column names and column types right from within the file dialog. But, the feature is not turned on by default.
See Chris's article to find out more of what the feature offers, how to turn it on, and why it's not turned on by default.