Help! I walk through every door I try to open!

I'm playing a new game of x-com: Enemy Unknown, and the first mission my x-com soldiers were able to perform was capturing a landed UFO.

Due to a combination of random chance and luck (bad or good? I can't say...) I have secured the entirety of the exterior space with nary a Sectoid or Floater to be found. I have my soldiers massing in front of the landed UFO, but so far the aliens want to do this, "the Hard Way".

Obviously, charging straight through and triggering all kinds of reaction fire from however many completely healthy aliens remain aboard is a Bad Idea. But in the various farm doors, etc. that my x-com agents have used so far, they seem dead set on only opening the door when they want to pass through it.

How can I open the door to see what's in the room while not also simultaneously moving through the doorway? I could have sworn I was able to do it previously, but I can't, for the life of me, figure out how to do so again.

In UFO: Enemy Unknown (also known as X-Com) there was no way to open a door without passing through it to the next tile. If I remember correctly, they implemented right-click to open the door in Terror From The Deep.

Even though you can't prevent entering a door in UFO:EU, there are ways to mitigate retaliatory fire.

• Use a motion scanner while outside the door, it lets you see if there are anything inside.
• Put some proximity grenades outside and wait a few turns, see if any comes out.
• Use a HWP to open the door (if its two wide), they are more expendable than well trained troopers.
• Use the blaster launcher to blow up a hole somewhere else or look for an alternate entrance.

As mentioned, there isn't any way to just open a door without charging through. Grenades were always heavily underused, they are very powerful in the early stages of the game when your troops did not have great weaponry. If the UFO was shot down then there may well be holes in the body that will accept the gift of a grenade.

Failing that you'll just have to run someone in to soak up that reaction fire and then follow up with your main soldiers.