Can we use "ADE" functionality in AutoCAD instead of Civil 3D by loading any given ARX or DLL or any other file (available with Civil 3D) in AutoCAD ?
For reference, I'm attaching "acmaplisp.chm" file.
Generally no but if it's an .arx file then 'maybe' and then only if the functions within it do not rely on other dll's (which it probably does). Then there could be a license issue, that is, if you use it, it may look for another dll/function/whatever to check for a license.
Just thinking out loud though, it may work, give it a spin