You mapping folder should be like the PK3 tree. By this I mean everything should be inside the etmain folder.
In etmain, you’ll have:
- gfx (If you have custom Command Map icons)
- levelshots
- maps
- models
- profiles (Non-mapping, just to play, for a good list)
- scripts
- sound
- textures
- video (ET intro)
For instance 