You need this file to run map packs included in this mod.
You cannot play this mod without the DOOM 2 IWAD.
how to install
1. unzip file with file unzipping program such as WinRAR or 7Zip
2. read and understand the README.txt file in its entirety
2.5. install a source port if you haven't already (such as gzdoom)
3. drag and drop mod on source port exe file (eg. gzdoom.exe)
4. select DOOM 2 IWAD
5. play wolf3d without actually launching wolf3d