Yes. You only have to NOP a few instructions. Sadly, I can't tell you where, as the locations in OpenDUNE are already relocated, and do not represent any sane position inside the executable.

If I have to make a guess, and based on information I can recover, you will have to search for:

C4 5E 06 ; les bx, [bp+06]
26 81 4F 04 00 04 ; or es:[bx+4],0400
C4 5E FC ; les bx, [bp-04]

And you will need to NOP (= 0x90) the second line (for all 6 bytes). Or you can search only for the second line, and then it is most likely the second hit. Of course all references in Dune 1.07eu version Let me know if it works

I've tried it out, and it works (in the EU version, at least)! Thanks a lot for this tip

I've noticed that the code chunk that has to be NOP'd is repeated 3 times. I guess one's for the structures without foundations, the other for those that have foundations, and what's the third one for? Buildings that have partial foundations?

The first one is indeed when not placed on full slabs.
The third instance is related to units, not to structures.

Something to do with unit repairs? Or were the units supposed to take damage as well?

I remember in first and second mission, if the structure is on the slabs, it will not decay.

In first campaign, indeed. Second campaign degrading is active (in 1.07eu ).

I dont mean to bump this with the intention of causing havoc.

But this preview mode you speak of if actualy a left over of the scenario editor that was tied into the games, including C&C. WW had a logic of incorporating there scenario editors into the games core engine to allow the creators to tab between the editor and game. This mode is still in all C&C games up until Yuri's Revenge, but not as intact as it is here, funny.

If i can ever find the email i had that had the true name of this feature and how it worked for RA and TS, ill update this.

Just a little bit of trivia for ya!

Ha, cool That is nice to know I have been wondering if there is more to it then just show the whole map. You can select tiles, so one would almost think it would also be possible to manipulate the tiles. Maybe they removed that completely .. maybe not We will see

It would be nice if you can find any more information about this

Would be nice to check if Dune II Demo, which uses an obviously older build of the game, has more traces of the editor mode left

When I look at strings in "global" memory, I can see things like "\r\n[%s]\r\n", "%s=%d\r\n", "%s=%s\r\n" or "[%s]" (very similar to strings used for INI format). So maybe there's an integrated editor. But it can also be a left over from an older version.