Hey everyone.
Google brought me here because I'm having this same issue of being unable to launch pwads with GZDoom and a launcher (using ZDL). I currently have Eviternity, Sunlust, Valiant, and B2SX. When I try to launch Eviternity, Sunlust, or Valiant through ZDL, it skips that iWAD selection startup window, and loads the wrong iwad, which doesn't work obviously. Manually dragging and dropping the pwads onto the gzdoom.exe file loads the iwad selection startup window, but doens't let me load other mods with it; and while the .bat file method does work, i have other mods and stuff that i use and switch around, and i don't want to have to edit a .bat file every time i want to change up mods.
So is there a way to force GZDoom to load the iwad selection startup window when launched through ZDL? i don't know anything about the gameinfo lump, nor do i see anything with that filename anywhere.
Oh, and for whatever reason, both B2SX episodes do launch from ZDL properly. For whatever reason the iwad selection startup menu does load when i launch them through ZDL, and i have no idea why it's different.
Thanks so much. BTW eviternity is amazing lol.