It has been a while I did not work on skwin -- at some point because I had some HDD failure then issues with my dev environment a couple of years ago ...
But I should be able to find working copies of the project and rebuild at the point where we were.
Short answer: it is not yet complete. The DM2 dungeon is playable but some functions are not yet implemented and I remind some crashes may happen.
However we did some efforts to make the code compatible with PC-DOS data, enabling in some way the 256 colors graphics and also extend some capabilities of the program, hence modified versions of DMDC2 and DMGDED to match the engine. But I think these versions should still work for 'regular' edition.
I need to check this stuff.
I kept different versions of the program in order to be able to build the "standard" version which is based on the PC-98 and the others having the extended capabilities, hence the differents exe.
Extended version has the new extended functions over Standard version -- which should match retail DM2 behaviour.
Super/SuperMode is a test mode for starting with overboosted champions
For what I recall, JP_JP is the japanese version (original PC-98 program) using the full Japanese graphics.dat and EN_JP is a mix with English (from the graphics.dat too I think ?) Because there have been several versions of graphics.dat.
The "mod.release" might be the old name for "extended".
The menu should allow to select the different original dungeons (Dungeon Master / Chaos Strikes Back / Skullkeep (beta) / Skullkeep) as long as the corresponding dungeon.dat are provided. Maybe there are missing in the package you took... As well for Theron Quest, that I don't find anymore in my local workspace. I need to gather all pieces to rebuild this.
The other dungeons (DM1) cannot be yet fully playable because some original DM functions -- specially those around the actuators -- were obviously dropped from the original code from DM1 to DM2. Although using CSBWin code it would be possible to import them back to SKWin code.
Then I know what I will work on in the next following weeks