i`m using Mac, OS X EI Capitan 10.11.5, Unity 5.4.0b23 Personal.i have two issues about creating managed plugins. 1) in the page "Unity Manual / Working In Unity / Advanced Development / Plugins / Managed Plugins" of 5.4 beta document, the "Creating a DLL" section, it said UnityEngine.dll and UnityEditor.dll will be placed inside "/Applications/Unity/Unity.app/Contents/Frameworks/Managed/", but actually i found them inside "/Applications/Unity/Unity.app/Contents/Managed/" on my machine. 2) in MonoDevelop, i`m trying to add references of these two dlls to my project. the document said i should " choose the option .Net Assembly tab > File System > select file", but i can`t found anything looks like "File System" while the ".Net Assembly tab" is selected, and also there`s nothing looks like "select file", instead there`s a "Browse" button, it will bring me a file dialog for dll seeking. the problem is, this dialog can not navigate into a .app bundle, all app bundles are gray out so they can not be selected and navigate in, thus i can not pick anything from their internal folders. there`s a workaround for problem 2: right click Unity.app, select "Quick Look", then Unity.app will be selected and a quick look popup will be shown. now close the popup and press CMD+DownArrowKey, the file dialog will then navigate inside the app bundle.