Accessing folders outside of nopCommerce

I know this is not directly a nopCommerce problem but hoping somebody here can educate me.

Used to run v3.7 now upgraded to 4.2

In the past, I could access files in other folders outside nopCommerce.  Specifically, I have a couple apps that I publish via Visual Studio's "OneClick" method that can be installed from the web.  So in the past I could visit URL:
      http://www.mysite.com/myapp/publish.htm
and the server would display the app installation page for that app.

Now that I've upgraded to nopCommerce 4.2 it seems I can no longer do this.   When I enter that URL I just get a 404 error from nopCommerce.

I don't recall having to make any changes to nopCommerce back in 3.70 to enable this.  But it's been many years so maybe there is a setting or something I switched and just don't remember?  

Any help would be appreciated.

Are you looking for this?

If you are just serving up plain .html files, you could put them in the \files subfolder (or create subfolders there).

Here was my solution for future seekers:

Create a folder in the root of your web server and mark it as an application starting point.

Then create a web.config file with the following and place in that folder:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <system.webServer>
    <modules>
      <remove name="WebDAVModule" />
    </modules>
    <handlers>
      <remove name="WebDAV" />
    <remove name="aspNetCore" />
    </handlers>
  </system.webServer>
</configuration>

Problem solved.