Adding ASP.NET Web API killed legacy handlers

I'v read and applied How to add Web API to an existing ASP.NET MVC 4 Web Application project?

The project is a pseudo MVP project, it loads and configures MVP but it has no controllers, just handlers. I added an ASP.NET Web Api. Now all the *.aws are returning 404 (not the IIS detailed error page however)

I tried removing MVC runtime to no avail. Help?

web.config

  <system.web>
    <compilation debug="true" targetFramework="4.6.2">
      <assemblies>
        <!-- 
        <add assembly="System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
        -->
        <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
        <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
        <add assembly="System.ComponentModel.DataAnnotations, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
        <add assembly="System.Web.Helpers, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
        <add assembly="System.Web.WebPages, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
      </assemblies>
      <expressionBuilders></expressionBuilders>
    </compilation>
    <pages controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID">
      <namespaces>
        <!-- 
        <add namespace="System.Web.Mvc" />
        <add namespace="System.Web.Mvc.Ajax" />
        <add namespace="System.Web.Mvc.Html" />
        -->
        <add namespace="System.Web.Routing" />
        <add namespace="System.Web.Helpers" />
        <add namespace="System.Web.WebPages" />
      </namespaces>
    </pages>
    <httpRuntime enableVersionHeader="false" />
  </system.web>
  <system.webServer>
<modules runAllManagedModulesForAllRequests="true" />
<validation validateIntegratedModeConfiguration="false" />
    <handlers>
      <add name="Redacted Handler" path="redacted.aws" verb="*" type="Redacted.Handler" resourceType="Unspecified" preCondition="integratedMode" />
    <httpProtocol>
      <customHeaders>
        <remove name="X-Powered-By" />
      </customHeaders>
    </httpProtocol>
  </system.webServer>
  <system.net>
    <defaultProxy enabled="true" useDefaultCredentials="false"></defaultProxy>
  </system.net>