The files in this directory are designed for one or more of the so-called "Source Ports", which are modifications of the DOOM source code that was released by id Software in December 1997. You will need to look through the text files to see which port a wad was made for. Some will work on more than one, and some are very specific not only to which port but to which version or modification of that port. If you have any questions or problems with these files, contact the authors. Their email addresses should be in the matching .txt file.