Has anyone tried to put a regular file to the root directory of a sharepoint web application's IIS site. It does not work. For example create an index.html file in the root directory of your web application on the server filesystem and call it like sharepointwebappurl/index.html this will not work. But create a directory in (e.g. subfolder) and put index.html into that folder. sharepointwebappurl/subfolder/index.html now it works
I am aware of some exceptions (put robot.txt in IIS root, it works)
I know I can upload index.html via Sharepoint Designer to the root folder of a web app and keep it in content db. But this option is not suitable for our case.