It worked! I have to let you all know that when I tried with doom.wad and doom1.wad (as an IWAD), it loaded normally, but I knew there was an issue once I saw the pointer icon showed up as rabbit ears. It also produced the sounds from both Doom and Ultimate Doom as a result. The screen also showed stairs from each of those games and wall designs from Chex Quest 2. Once I switched the IWAD to CHEX, the pointer changed to a Chex icon. The walls appeared normal (with the regular Chex Quest 2 designs), so I'm going to guess that I did what was necessary to get Chex Quest 2 running correctly. Thanks for all of your help.