Assets folder where?

For example i go through “twin stick shooter” in “Assets” folder there is only some textures.

I can’t find any character, or weapon ? Where are they ?

Is there some option to open project folder in one click ?

I think the 3d assets themselves are included in the actual .Blend file itself (being a 3d format file format). If you’re using the Armory 2.8 version, all the meshes, characters, camera’s, etc. are located in Collection 1.

As for opening the project folder, if you open up the “Armory Project” tab, there’s a button for that: