How do I view what enemy is holding in openxcom?

I have been watching the Yogscast's openxcom series for some time and I have noticed that they press a button while playing The XCOM files modpack that allows them to view what enemies are holding in their hands and if they are wounded. While looking through the settings of openxcom, I cannot find the button that shows these stats. For example:

What is the button for this in openxcom or is this an additional mod/feature for The XCOM files?

Middle-mouse-click on the unit.

This is an additional feature of OpenXcom Extended (used by mods like X-Com Files and X-Piratez).

It's a feature of OpenXcom, but only works on mindcontrolled, non terrorist aliens.

Here's a list of all differences between the Xcom and openXcom. The inventory view is mentioned in the "Battlescape" section.