diff --git a/src/AddIns/Uno.UI.Lottie/LottieVisualSourceBase.wasm.cs b/src/AddIns/Uno.UI.Lottie/LottieVisualSourceBase.wasm.cs
index 512ef33f0d26..cc1339cef829 100644
--- a/src/AddIns/Uno.UI.Lottie/LottieVisualSourceBase.wasm.cs
+++ b/src/AddIns/Uno.UI.Lottie/LottieVisualSourceBase.wasm.cs
@@ -13,8 +13,6 @@ namespace Microsoft.Toolkit.Uwp.UI.Lottie
 {
 	partial class LottieVisualSourceBase
 	{
-		private static readonly string? UNO_BOOTSTRAP_APP_BASE = global::System.Environment.GetEnvironmentVariable(nameof(UNO_BOOTSTRAP_APP_BASE));
-
 		private AnimatedVisualPlayer? _initializedPlayer;
 		private Uri? _lastSource;
 		private Size _compositionSize = new Size(0, 0);
@@ -101,9 +99,7 @@ void OnJsonChanged(string updatedJson, string updatedCacheKey)
 				}
 				else
 				{
-					var documentPath = string.IsNullOrEmpty(UNO_BOOTSTRAP_APP_BASE)
-						? UriSource?.PathAndQuery
-						: UNO_BOOTSTRAP_APP_BASE + UriSource?.PathAndQuery;
+					var documentPath = Windows.Storage.Helpers.AssetsPathBuilder.BuildAssetUri(UriSource?.PathAndQuery);
 					_domLoaded = false;
 
 					js = new[]
diff --git a/src/AddIns/Uno.UI.Lottie/Uno.UI.Lottie.Wasm.csproj b/src/AddIns/Uno.UI.Lottie/Uno.UI.Lottie.Wasm.csproj
index 78b2ae8c84e6..128cbfc91d57 100644
--- a/src/AddIns/Uno.UI.Lottie/Uno.UI.Lottie.Wasm.csproj
+++ b/src/AddIns/Uno.UI.Lottie/Uno.UI.Lottie.Wasm.csproj
@@ -3,8 +3,8 @@
 		<TargetFrameworks>netstandard2.0</TargetFrameworks>
 	</PropertyGroup>
 
-	<Import Project="../../netcore-build.props"/>
-	<Import Project="../../targetframework-override.props"/>
+	<Import Project="../../netcore-build.props" />
+	<Import Project="../../targetframework-override.props" />
 
 	<PropertyGroup>
 		<NoWarn>$(NoWarn);NU1701</NoWarn>
@@ -28,6 +28,7 @@
 
 	<ItemGroup>
 		<None Remove="tsconfig.json" />
+		<Compile Include="..\..\Uno.UWP\Storage\Helpers\AssetsPathBuilder.wasm.cs" Link="AssetsPathBuilder.wasm.cs" />
 		<Content Include="tsconfig.json" />
 	</ItemGroup>
 	
diff --git a/src/Uno.UI/UI/Xaml/Media/Imaging/BitmapImage.wasm.cs b/src/Uno.UI/UI/Xaml/Media/Imaging/BitmapImage.wasm.cs
index 4a854d11756e..8bae4685c94c 100644
--- a/src/Uno.UI/UI/Xaml/Media/Imaging/BitmapImage.wasm.cs
+++ b/src/Uno.UI/UI/Xaml/Media/Imaging/BitmapImage.wasm.cs
@@ -9,6 +9,7 @@
 using Uno.Extensions;
 using Uno.Foundation;
 using Windows.Graphics.Display;
+using Windows.Storage.Helpers;
 using Windows.Storage.Streams;
 using Path = global::System.IO.Path;
 
@@ -16,8 +17,6 @@ namespace Windows.UI.Xaml.Media.Imaging
 {
 	public sealed partial class BitmapImage : BitmapSource
 	{
-		private static readonly string UNO_BOOTSTRAP_APP_BASE = Environment.GetEnvironmentVariable(nameof(UNO_BOOTSTRAP_APP_BASE));
-
 		internal ResolutionScale? ScaleOverride { get; set; }
 
 		internal string ContentType { get; set; } = "application/octet-stream";
@@ -72,7 +71,7 @@ internal static class AssetResolver
 
 			private static async Task<HashSet<string>> GetAssets()
 			{
-				var assetsUri = !string.IsNullOrEmpty(UNO_BOOTSTRAP_APP_BASE) ? $"{UNO_BOOTSTRAP_APP_BASE}/uno-assets.txt" : "uno-assets.txt";
+				var assetsUri = AssetsPathBuilder.BuildAssetUri("uno-assets.txt");
 
 				var assets = await WebAssemblyRuntime.InvokeAsync($"fetch('{assetsUri}').then(r => r.text())");
 
@@ -137,14 +136,12 @@ private static string GetScaledPath(string path, HashSet<string> assets, Resolut
 
 							if (assets.Contains(filePath))
 							{
-								return !string.IsNullOrEmpty(UNO_BOOTSTRAP_APP_BASE) ?
-									$"{UNO_BOOTSTRAP_APP_BASE}/{filePath}" :
-									filePath;
+								return AssetsPathBuilder.BuildAssetUri(filePath);
 							}
 						}
 					}
 
-					return !string.IsNullOrEmpty(UNO_BOOTSTRAP_APP_BASE) ? $"{UNO_BOOTSTRAP_APP_BASE}/{path}" : path;
+					return AssetsPathBuilder.BuildAssetUri(path);
 				}
 
 				return path;
diff --git a/src/Uno.UI/UI/Xaml/Media/Imaging/SvgImageSource.wasm.cs b/src/Uno.UI/UI/Xaml/Media/Imaging/SvgImageSource.wasm.cs
index 4634d03ed507..bad80208a130 100644
--- a/src/Uno.UI/UI/Xaml/Media/Imaging/SvgImageSource.wasm.cs
+++ b/src/Uno.UI/UI/Xaml/Media/Imaging/SvgImageSource.wasm.cs
@@ -8,13 +8,12 @@
 using Uno.Extensions;
 using Uno.Logging;
 using static Windows.UI.Xaml.Media.Imaging.BitmapImage;
+using Windows.Storage.Helpers;
 
 namespace Windows.UI.Xaml.Media.Imaging
 {
 	partial class SvgImageSource
 	{
-		private static readonly string UNO_BOOTSTRAP_APP_BASE = Environment.GetEnvironmentVariable(nameof(UNO_BOOTSTRAP_APP_BASE));
-
 		internal string ContentType { get; set; } = "image/svg+xml";
 
 		partial void InitPartial()
@@ -52,7 +51,7 @@ private protected override bool TryOpenSourceSync(int? targetWidth, int? targetH
 				}
 				else
 				{
-					var path = Path.Combine(UNO_BOOTSTRAP_APP_BASE, uri.OriginalString);
+					var path = AssetsPathBuilder.BuildAssetUri(uri.OriginalString);
 					image = new ImageData
 					{
 						Kind = ImageDataKind.Url,
diff --git a/src/Uno.UWP/Storage/Helpers/AssetsManager.wasm.cs b/src/Uno.UWP/Storage/Helpers/AssetsManager.wasm.cs
index df15ba80f960..4463dd856cb4 100644
--- a/src/Uno.UWP/Storage/Helpers/AssetsManager.wasm.cs
+++ b/src/Uno.UWP/Storage/Helpers/AssetsManager.wasm.cs
@@ -24,14 +24,12 @@ namespace Windows.Storage.Helpers
 {
 	internal partial class AssetsManager
 	{
-		private static readonly string UNO_BOOTSTRAP_APP_BASE = Environment.GetEnvironmentVariable(nameof(UNO_BOOTSTRAP_APP_BASE)) ?? "";
-
 		private static readonly Lazy<Task<HashSet<string>>> _assets = new Lazy<Task<HashSet<string>>>(() => GetAssets(CancellationToken.None));
 		private static readonly ConcurrentEntryManager _assetsGate = new ConcurrentEntryManager();
 
 		private static async Task<HashSet<string>> GetAssets(CancellationToken ct)
 		{
-			var assetsUri = !string.IsNullOrEmpty(UNO_BOOTSTRAP_APP_BASE) ? $"{UNO_BOOTSTRAP_APP_BASE}/uno-assets.txt" : "uno-assets.txt";
+			var assetsUri = AssetsPathBuilder.BuildAssetUri("uno-assets.txt");
 
 			var assets = await WebAssemblyRuntime.InvokeAsync($"Windows.Storage.AssetManager.DownloadAssetsManifest(\'{assetsUri}\')");
 
@@ -45,13 +43,13 @@ public static async Task<string> DownloadAsset(CancellationToken ct, string asse
 
 			if (assetSet.Contains(updatedPath))
 			{
-				var localPath = Path.Combine(Windows.Storage.ApplicationData.Current.LocalFolder.Path, ".assetsCache", UNO_BOOTSTRAP_APP_BASE, updatedPath);
+				var localPath = Path.Combine(Windows.Storage.ApplicationData.Current.LocalFolder.Path, ".assetsCache", AssetsPathBuilder.UNO_BOOTSTRAP_APP_BASE, updatedPath);
 
 				using var assetLock = await _assetsGate.LockForAsset(ct, updatedPath);
 
 				if (!File.Exists(localPath))
 				{
-					var assetUri = !string.IsNullOrEmpty(UNO_BOOTSTRAP_APP_BASE) ? $"{UNO_BOOTSTRAP_APP_BASE}/{updatedPath}" : updatedPath;
+					var assetUri = AssetsPathBuilder.BuildAssetUri(updatedPath);
 					var assetInfo = await WebAssemblyRuntime.InvokeAsync($"Windows.Storage.AssetManager.DownloadAsset(\'{assetUri}\')");
 
 					var parts = assetInfo.Split(';');
diff --git a/src/Uno.UWP/Storage/Helpers/AssetsPathBuilder.wasm.cs b/src/Uno.UWP/Storage/Helpers/AssetsPathBuilder.wasm.cs
new file mode 100644
index 000000000000..865510f15d8c
--- /dev/null
+++ b/src/Uno.UWP/Storage/Helpers/AssetsPathBuilder.wasm.cs
@@ -0,0 +1,25 @@
+#nullable enable
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Windows.Storage.Helpers
+{
+	/// <summary>
+	/// WebAssembly assets path builder
+	/// </summary>
+	internal static class AssetsPathBuilder
+	{
+		public static readonly string UNO_BOOTSTRAP_APP_BASE = Environment.GetEnvironmentVariable(nameof(UNO_BOOTSTRAP_APP_BASE)) ?? "";
+		private static readonly string UNO_BOOTSTRAP_WEBAPP_BASE_PATH = Environment.GetEnvironmentVariable(nameof(UNO_BOOTSTRAP_WEBAPP_BASE_PATH)) ?? "";
+
+		/// <summary>
+		/// Builds an actual asset path
+		/// </summary>
+		public static string? BuildAssetUri(string? contentRelativePath)
+			=> !string.IsNullOrEmpty(UNO_BOOTSTRAP_APP_BASE)
+				? $"{UNO_BOOTSTRAP_WEBAPP_BASE_PATH}{UNO_BOOTSTRAP_APP_BASE}/{contentRelativePath}"
+				: contentRelativePath;
+	}
+}