Hi Suzy

The 404handlers.config was removed

You now control how the content finders work yourself with your own composer like this:

using Umbraco.Core;
using Umbraco.Core.Composing;
using Umbraco.Web.Routing;

namespace MyProject.Web.Compose
{
    [RuntimeLevel(MinLevel = RuntimeLevel.Run)]
    public class ContentFinderComposer : IUserComposer
    {
        public void Compose(Composition composition)
        {
            //clear the collection
            composition.WithCollectionBuilder<ContentFinderCollectionBuilder>().Clear();

            //add them back in the right order
            composition.WithCollectionBuilder<ContentFinderCollectionBuilder>()
                .Append<ContentFinderByPageIdQuery>()
                .Append<ContentFinderByUrl>()
                .Append<ContentFinderByIdPath>()

                //add the url and template one back in here
                .Append<ContentFinderByUrlAndTemplate>()

                .Append<ContentFinderByUrlAlias>()
                .Append<ContentFinderByRedirectUrl>();
        }
    }
}

I just tested it and it works for me.