Yes, mk1995 has attached it to one of his posts:
viewtopic.php?p=11036#p11036
You need to start the included PRINCEw3.EXE.
The graphics files have numbered names like V0.DAT, V1.DAT, ..., because if I used names (e.g. VDUNGEON.DAT, VPALACE.DAT, and then Vname.DAT), there would be no space in the EXE to store the names.
At 0x1c842 in PRINCEw3.EXE you can find the table that determines which level has which environment. (which is also present in the original EXE)
The following list shows which numbers can be used for which graphics types:
0, 4, 8, ... : dungeons that use dungeon wda - all dungeons
1, 5, 9, ... : palaces that use dungeon wda
2, 6, 10, ... : dungeons that use palace wda - I don't know of such graphics
3, 7, 11, ... : palaces that use palace wda
The lowest bit of the number of the environment determines the type of the environment: 0 means dungeon, 1 means palace.
The next bit of the number determines the wall drawing algorithm to use: 0 means dungeon, 1 means palace.
Also, the included 3env.txt lists all the modifications I made to the EXE.