diff --git a/src/Squirrel/DeltaPackage.cs b/src/Squirrel/DeltaPackage.cs
index de15030b..773bd56a 100644
--- a/src/Squirrel/DeltaPackage.cs
+++ b/src/Squirrel/DeltaPackage.cs
@@ -68,17 +68,11 @@ namespace Squirrel
                 this.Log().Info("Extracting {0} and {1} into {2}", 
                     basePackage.ReleasePackageFile, newPackage.ReleasePackageFile, tempPath);
 
+                Utility.ExtractZipToDirectory(basePackage.ReleasePackageFile, baseTempInfo.FullName).Wait();
                 var opts = new ExtractionOptions() { ExtractFullPath = true, Overwrite = true, PreserveFileTime = true };
 
-                using (var za = ZipArchive.Open(basePackage.ReleasePackageFile))
-                using (var reader = za.ExtractAllEntries()) {
-                    reader.WriteAllToDirectory(baseTempInfo.FullName, opts);
-                }
-
-                using (var za = ZipArchive.Open(basePackage.ReleasePackageFile))
-                using (var reader = za.ExtractAllEntries()) {
-                    reader.WriteAllToDirectory(tempInfo.FullName, opts);
-                }
+                Utility.ExtractZipToDirectory(basePackage.ReleasePackageFile, baseTempInfo.FullName).Wait();
+                Utility.ExtractZipToDirectory(newPackage.ReleasePackageFile, tempInfo.FullName).Wait();
 
                 // Collect a list of relative paths under 'lib' and map them
                 // to their full name. We'll use this later to determine in
@@ -95,10 +89,7 @@ namespace Squirrel
                 }
 
                 ReleasePackage.addDeltaFilesToContentTypes(tempInfo.FullName);
-                using (var za = ZipArchive.Create()) {
-                    za.AddAllFromDirectory(tempInfo.FullName);
-                    za.SaveTo(outputFile, CompressionType.Deflate);
-                }
+                Utility.CreateZipFromDirectory(outputFile, tempInfo.FullName).Wait();
             }
 
             return new ReleasePackage(outputFile);
diff --git a/src/Squirrel/ReleasePackage.cs b/src/Squirrel/ReleasePackage.cs
index 9a2fea96..903b0a8c 100644
--- a/src/Squirrel/ReleasePackage.cs
+++ b/src/Squirrel/ReleasePackage.cs
@@ -163,7 +163,7 @@ namespace Squirrel
 
                 contentsPostProcessHook?.Invoke(tempPath);
 
-                createZipEncoded(outputFile, tempPath);
+                Utility.CreateZipFromDirectory(outputFile, tempPath).Wait();
 
                 ReleasePackageFile = outputFile;
                 return ReleasePackageFile;
@@ -217,28 +217,6 @@ namespace Squirrel
             });
         }
 
-        // Create zip file with entry names %-encoded, as nupkg file does.
-        void createZipEncoded(string zipFilePath, string folder)
-        {
-            var sevenZip = Path.Combine(
-                Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location),
-                "7z.exe");
-
-            Utility.InvokeProcessAsync(sevenZip, String.Format("a \"{0}\" -tzip -mmt on *", zipFilePath), CancellationToken.None, folder)
-                .Wait();
-
-            /*
-            using (var archive = ZipArchive.Create())
-            using (var tgt = File.OpenWrite(zipFilePath)) {
-                archive.DeflateCompressionLevel = CompressionLevel.BestCompression;
-                archive.AddAllFromDirectory(folder);
-                archive.SaveTo(
-                    tgt,
-                    new WriterOptions(CompressionType.Deflate));
-            }
-            */
-        }
-
         void extractDependentPackages(IEnumerable<IPackage> dependencies, DirectoryInfo tempPath, FrameworkName framework)
         {
             dependencies.ForEach(pkg => {
diff --git a/src/Squirrel/Utility.cs b/src/Squirrel/Utility.cs
index cb513b00..55c68043 100644
--- a/src/Squirrel/Utility.cs
+++ b/src/Squirrel/Utility.cs
@@ -386,6 +386,20 @@ namespace Squirrel
             }
         }
 
+        public static async Task CreateZipFromDirectory(string zipFilePath, string inFolder)
+        {
+            var sevenZip = Utility.FindHelperExecutable("7z.exe");
+            var result = default(Tuple<int, string>);
+
+            try {
+                result = await Utility.InvokeProcessAsync(sevenZip, String.Format("a \"{0}\" -tzip -mmt on *", zipFilePath), CancellationToken.None, inFolder);
+                if (result.Item1 != 0) throw new Exception(result.Item2);
+            } catch (Exception ex) {
+                Log().Error($"Failed to extract file {zipFilePath} to {inFolder}\n{ex.Message}");
+                throw;
+            }
+        }
+
         public static string AppDirForRelease(string rootAppDirectory, ReleaseEntry entry)
         {
             return Path.Combine(rootAppDirectory, "app-" + entry.Version.ToString());