diff --git a/.gitignore b/.gitignore
index 36834898be..b1688a6811 100644
--- a/.gitignore
+++ b/.gitignore
@@ -170,3 +170,8 @@ build/temp/
 /src/Umbraco.Web.UI.NetCore/wwwroot/Media/*
 /src/Umbraco.Web.UI.NetCore/wwwroot/is-cache/*
 /src/Umbraco.Tests.Integration/App_Data/*
+/src/Umbraco.Web.UI.NetCore/wwwroot/Umbraco/assets/*
+/src/Umbraco.Web.UI.NetCore/wwwroot/Umbraco/js/*
+/src/Umbraco.Web.UI.NetCore/wwwroot/Umbraco/lib/*
+/src/Umbraco.Web.UI.NetCore/wwwroot/Umbraco/views/*
+/src/Umbraco.Web.UI.NetCore/wwwroot/App_Data/TEMP/*
diff --git a/src/Umbraco.Core/WebAssets/IRuntimeMinifier.cs b/src/Umbraco.Core/WebAssets/IRuntimeMinifier.cs
index 3cf2e9d722..5170ce243b 100644
--- a/src/Umbraco.Core/WebAssets/IRuntimeMinifier.cs
+++ b/src/Umbraco.Core/WebAssets/IRuntimeMinifier.cs
@@ -19,6 +19,12 @@ namespace Umbraco.Core.WebAssets
         /// </summary>
         /// <param name="bundleName"></param>
         /// <param name="filePaths"></param>
+        /// <remarks>
+        /// All files must be absolute paths, relative paths will throw <see cref="InvalidOperationException"/>
+        /// </remarks>
+        /// <exception cref="InvalidOperationException">
+        /// Thrown if any of the paths specified are not absolute
+        /// </exception>
         void CreateCssBundle(string bundleName, params string[] filePaths);
 
         /// <summary>
@@ -35,6 +41,12 @@ namespace Umbraco.Core.WebAssets
         /// </summary>
         /// <param name="bundleName"></param>
         /// <param name="filePaths"></param>
+        /// <remarks>
+        /// All files must be absolute paths, relative paths will throw <see cref="InvalidOperationException"/>
+        /// </remarks>
+        /// <exception cref="InvalidOperationException">
+        /// Thrown if any of the paths specified are not absolute
+        /// </exception>
         void CreateJsBundle(string bundleName, params string[] filePaths);
 
         /// <summary>
diff --git a/src/Umbraco.Infrastructure/WebAssets/BackOfficeWebAssets.cs b/src/Umbraco.Infrastructure/WebAssets/BackOfficeWebAssets.cs
index e2364074fb..612e3d6b53 100644
--- a/src/Umbraco.Infrastructure/WebAssets/BackOfficeWebAssets.cs
+++ b/src/Umbraco.Infrastructure/WebAssets/BackOfficeWebAssets.cs
@@ -44,23 +44,23 @@ namespace Umbraco.Web.WebAssets
             // Create bundles
 
             _runtimeMinifier.CreateCssBundle(UmbracoInitCssBundleName,
-                "lib/bootstrap-social/bootstrap-social.css",
+                FormatPaths("lib/bootstrap-social/bootstrap-social.css",
                 "assets/css/umbraco.css",
-                "lib/font-awesome/css/font-awesome.min.css");
+                "lib/font-awesome/css/font-awesome.min.css"));
 
             _runtimeMinifier.CreateCssBundle(UmbracoUpgradeCssBundleName,
-                "assets/css/umbraco.css",
+                FormatPaths("assets/css/umbraco.css",
                 "lib/bootstrap-social/bootstrap-social.css",
-                "lib/font-awesome/css/font-awesome.min.css");
+                "lib/font-awesome/css/font-awesome.min.css"));
 
             _runtimeMinifier.CreateCssBundle(UmbracoPreviewCssBundleName,
-                "assets/css/canvasdesigner.css");
+                FormatPaths("assets/css/canvasdesigner.css"));
 
             _runtimeMinifier.CreateJsBundle(UmbracoPreviewJsBundleName,
-                GetScriptsForPreview().ToArray());
+                FormatPaths(GetScriptsForPreview()));
 
             _runtimeMinifier.CreateJsBundle(UmbracoTinyMceJsBundleName,
-                GetScriptsForTinyMce().ToArray());
+                FormatPaths(GetScriptsForTinyMce()));
 
             var propertyEditorAssets = ScanPropertyEditors()
                 .GroupBy(x => x.AssetType)
@@ -68,13 +68,15 @@ namespace Umbraco.Web.WebAssets
 
             _runtimeMinifier.CreateJsBundle(
                 UmbracoJsBundleName,
-                GetScriptsForBackoffice(
-                    propertyEditorAssets.TryGetValue(AssetType.Javascript, out var scripts) ? scripts : Enumerable.Empty<string>()));
+                FormatPaths(
+                    GetScriptsForBackoffice(
+                        propertyEditorAssets.TryGetValue(AssetType.Javascript, out var scripts) ? scripts : Enumerable.Empty<string>())));
 
             _runtimeMinifier.CreateCssBundle(
                 UmbracoCssBundleName,
-                GetStylesheetsForBackoffice(
-                    propertyEditorAssets.TryGetValue(AssetType.Css, out var styles) ? styles : Enumerable.Empty<string>()));
+                FormatPaths(
+                    GetStylesheetsForBackoffice(
+                        propertyEditorAssets.TryGetValue(AssetType.Css, out var styles) ? styles : Enumerable.Empty<string>())));
         }
 
         /// <summary>
@@ -92,7 +94,7 @@ namespace Umbraco.Web.WebAssets
             foreach (var script in propertyEditorScripts)
                 scripts.Add(script);
 
-            return new HashSet<string>(FormatPaths(scripts)).ToArray();
+            return scripts.ToArray();
         }
 
         /// <summary>
@@ -118,27 +120,27 @@ namespace Umbraco.Web.WebAssets
             foreach (var stylesheet in propertyEditorStyles)
                 stylesheets.Add(stylesheet);
 
-            return new HashSet<string>(FormatPaths(stylesheets)).ToArray();
+            return stylesheets.ToArray();
         }
 
         /// <summary>
         /// Returns the scripts used for tinymce
         /// </summary>
         /// <returns></returns>
-        private IEnumerable<string> GetScriptsForTinyMce()
+        private string[] GetScriptsForTinyMce()
         {
             var resources = JsonConvert.DeserializeObject<JArray>(Resources.TinyMceInitialize);
-            return resources.Where(x => x.Type == JTokenType.String).Select(x => x.ToString());
+            return resources.Where(x => x.Type == JTokenType.String).Select(x => x.ToString()).ToArray();
         }
 
         /// <summary>
         /// Returns the scripts used for preview
         /// </summary>
         /// <returns></returns>
-        private IEnumerable<string> GetScriptsForPreview()
+        private string[] GetScriptsForPreview()
         {
             var resources = JsonConvert.DeserializeObject<JArray>(Resources.PreviewInitialize);
-            return resources.Where(x => x.Type == JTokenType.String).Select(x => x.ToString());
+            return resources.Where(x => x.Type == JTokenType.String).Select(x => x.ToString()).ToArray();
         }
 
         /// <summary>
@@ -146,7 +148,7 @@ namespace Umbraco.Web.WebAssets
         /// </summary>
         /// <param name="assets"></param>
         /// <returns></returns>
-        private IEnumerable<string> FormatPaths(IEnumerable<string> assets)
+        private string[] FormatPaths(params string[] assets)
         {
             var umbracoPath = _ioHelper.GetUmbracoMvcArea();
 
@@ -156,7 +158,7 @@ namespace Umbraco.Web.WebAssets
                     // most declarations with be made relative to the /umbraco folder, so things
                     // like lib/blah/blah.js so we need to turn them into absolutes here
                     ? umbracoPath.EnsureStartsWith('/').TrimEnd("/") + x.EnsureStartsWith('/')
-                    : x).ToList();
+                    : x).ToArray();
         }
 
         /// <summary>
diff --git a/src/Umbraco.Infrastructure/WebAssets/PreviewInitialize.js b/src/Umbraco.Infrastructure/WebAssets/PreviewInitialize.js
index 0b0c24f378..764e354d5f 100644
--- a/src/Umbraco.Infrastructure/WebAssets/PreviewInitialize.js
+++ b/src/Umbraco.Infrastructure/WebAssets/PreviewInitialize.js
@@ -1,14 +1,14 @@
 [
-    '../lib/jquery/jquery.min.js',
-    '../lib/angular/angular.js',
-    '../lib/underscore/underscore-min.js',
-    '../lib/umbraco/Extensions.js',
-    '../js/app.js',
-    '../js/umbraco.resources.js',
-    '../js/umbraco.services.js',
-    '../js/umbraco.interceptors.js',
-    '../ServerVariables',
-    '../lib/signalr/jquery.signalR.js',
-    '../BackOffice/signalr/hubs',
-    '../js/umbraco.preview.js'
+    'lib/jquery/jquery.min.js',
+    'lib/angular/angular.js',
+    'lib/underscore/underscore-min.js',
+    'lib/umbraco/Extensions.js',
+    'js/app.js',
+    'js/umbraco.resources.js',
+    'js/umbraco.services.js',
+    'js/umbraco.interceptors.js',
+    'ServerVariables',
+    'lib/signalr/jquery.signalR.js',
+    'BackOffice/signalr/hubs',
+    'js/umbraco.preview.js'
 ]
diff --git a/src/Umbraco.Web.Common/RuntimeMinification/SmidgeRuntimeMinifier.cs b/src/Umbraco.Web.Common/RuntimeMinification/SmidgeRuntimeMinifier.cs
index b56a392bf3..c279fd0280 100644
--- a/src/Umbraco.Web.Common/RuntimeMinification/SmidgeRuntimeMinifier.cs
+++ b/src/Umbraco.Web.Common/RuntimeMinification/SmidgeRuntimeMinifier.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Threading.Tasks;
 using Smidge;
 using Smidge.CompositeFiles;
@@ -51,6 +52,9 @@ namespace Umbraco.Web.Common.RuntimeMinification
         // only issue with creating bundles like this is that we don't have full control over the bundle options, though that could 
         public void CreateCssBundle(string bundleName, params string[] filePaths)
         {
+            if (filePaths.Any(f => !f.StartsWith("/") && !f.StartsWith("~/")))
+                throw new InvalidOperationException("All file paths must be absolute");
+
             if (_bundles.Exists(bundleName))
                 throw new InvalidOperationException($"The bundle name {bundleName} already exists");
 
@@ -65,6 +69,9 @@ namespace Umbraco.Web.Common.RuntimeMinification
 
         public void CreateJsBundle(string bundleName, params string[] filePaths)
         {
+            if (filePaths.Any(f => !f.StartsWith("/") && !f.StartsWith("~/")))
+                throw new InvalidOperationException("All file paths must be absolute");
+
             if (_bundles.Exists(bundleName))
                 throw new InvalidOperationException($"The bundle name {bundleName} already exists");
 
diff --git a/src/Umbraco.Web.UI.NetCore/HomeController.cs b/src/Umbraco.Web.UI.NetCore/HomeController.cs
new file mode 100644
index 0000000000..15d6d055d2
--- /dev/null
+++ b/src/Umbraco.Web.UI.NetCore/HomeController.cs
@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+
+// For more information on enabling MVC for empty projects, visit https://go.microsoft.com/fwlink/?LinkID=397860
+
+namespace Umbraco.Web.UI.BackOffice
+{
+    public class HomeController : Controller
+    {
+        // GET: /<controller>/
+        public IActionResult Index()
+        {
+            return View();
+        }
+    }
+}
diff --git a/src/Umbraco.Web/WebAssets/CDF/ClientDependencyRuntimeMinifier.cs b/src/Umbraco.Web/WebAssets/CDF/ClientDependencyRuntimeMinifier.cs
index 528b30088b..cf0e001d3b 100644
--- a/src/Umbraco.Web/WebAssets/CDF/ClientDependencyRuntimeMinifier.cs
+++ b/src/Umbraco.Web/WebAssets/CDF/ClientDependencyRuntimeMinifier.cs
@@ -25,9 +25,6 @@ namespace Umbraco.Web.WebAssets.CDF
         private readonly IIOHelper _ioHelper;
         private readonly ILogger _logger;
         private readonly IUmbracoVersion _umbracoVersion;
-        private readonly IManifestParser _manifestParser;
-        private readonly IGlobalSettings _globalSettings;
-        private readonly PropertyEditorCollection _propertyEditorCollection;
 
         public string CacheBuster => ClientDependencySettings.Instance.Version.ToString();
 
@@ -35,22 +32,19 @@ namespace Umbraco.Web.WebAssets.CDF
             IHttpContextAccessor httpContextAccessor,
             IIOHelper ioHelper,
             ILogger logger,
-            IUmbracoVersion umbracoVersion,
-            IManifestParser manifestParser,
-            IGlobalSettings globalSettings,
-            PropertyEditorCollection propertyEditorCollection)
+            IUmbracoVersion umbracoVersion)
         {
             _httpContextAccessor = httpContextAccessor;
             _ioHelper = ioHelper;
             _logger = logger;
             _umbracoVersion = umbracoVersion;
-            _manifestParser = manifestParser;
-            _globalSettings = globalSettings;
-            _propertyEditorCollection = propertyEditorCollection;
         }
 
         public void CreateCssBundle(string bundleName, params string[] filePaths)
         {
+            if (filePaths.Any(f => !f.StartsWith("/") && !f.StartsWith("~/")))
+                throw new InvalidOperationException("All file paths must be absolute");
+
             BundleManager.CreateCssBundle(
                 bundleName,
                 filePaths.Select(x => new CssFile(x)).ToArray());
@@ -65,6 +59,9 @@ namespace Umbraco.Web.WebAssets.CDF
 
         public void CreateJsBundle(string bundleName, params string[] filePaths)
         {
+            if (filePaths.Any(f => !f.StartsWith("/") && !f.StartsWith("~/")))
+                throw new InvalidOperationException("All file paths must be absolute");
+
             BundleManager.CreateJsBundle(
                 bundleName,
                 filePaths.Select(x => new JavascriptFile(x)).ToArray());