Martek: It happens on my install as well, with that save. (btw winzip opened it just fine)
Tried I'm sure some of the usual things - snuck in with no kills; re-enter bldg several times; scooch around my position relativ to the door, reload from a save right in front of the door, etc. No luck.
Okay, thanks for giving it a try and confirming the bug happens to you as well. And yeah, I tried all of those things myself, even went back to Leboa-Sako, and then re-enter Bowa Seko, thinking that maybe forcing it to reload that area would fix it, but no such luck.
Martek: Now, on my most recent two playthroughs (one of which is still in progress), I think I rescued that buddy, well - all the buddies - without waiting for those missions. Not sure if that gives better odds of not hitting the bug - but it's there to try.
Ealier you mentioned you didn't keep backup saves. Does that mean you haven't saved the game manually except until the bug? (ironman mode?) Or you've deleted the saves that accumulate in the save folder (because quick saves accumulate and dont overwrite [at least on my GOG version] -but you already know that since you went to the folder to jpg that save)?
About the saves, no ironman here, I just deleted all the excess saves that had accumulated every time I finished playing, keeping only the most recent three or four saves. Unfortunately, all of those kept saves were after accepting the mission, and thus, all had the door bug.
I have since restarted and am playing through the game again, this time I'm making sure to keep some backup saves, and also will try rescuing the buddy as soon as arriving in Bowa Seko rather than waiting for the mission to do so. Hopefully I won't encounter the bug again.