(zDoom) Can't get Action DooM to play

[hung like keen]

Using zDoom 2.5.0, I can't get Action DooM to run, let alone get zDoom to recognize it for me to select it in the IWAD selection screen. I've got the Action DooM WAD and the Doom 2 WAD in the same folder as the zDoom exec, and I've tried dragging the Action DooM WAD over the exec, but that just launches Doom 2. I have no trouble running Action DooM 2, but that's not surprising considering it's a standalone. I'm also having some trouble running Strain (using the 'fixed' StrainFix.WAD).