Index: trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/HeuristicLab.Problems.Instances.VehicleRouting-3.4.csproj
===================================================================
--- trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/HeuristicLab.Problems.Instances.VehicleRouting-3.4.csproj	(revision 11623)
+++ trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/HeuristicLab.Problems.Instances.VehicleRouting-3.4.csproj	(revision 11650)
@@ -109,11 +109,8 @@
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="ICSharpCode.SharpZipLib">
-      <HintPath>..\..\HeuristicLab.PluginInfrastructure\3.3\ICSharpCode.SharpZipLib.dll</HintPath>
-      <Private>False</Private>
-    </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />
     <Reference Include="System.Data" />
+    <Reference Include="System.IO.Compression" />
   </ItemGroup>
   <ItemGroup>
Index: trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/LiLimFormat/LiLimInstanceProvider.cs
===================================================================
--- trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/LiLimFormat/LiLimInstanceProvider.cs	(revision 11623)
+++ trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/LiLimFormat/LiLimInstanceProvider.cs	(revision 11650)
@@ -21,10 +21,4 @@
 
 using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Reflection;
-using System.Text.RegularExpressions;
-using ICSharpCode.SharpZipLib.Zip;
 
 namespace HeuristicLab.Problems.Instances.VehicleRouting {
Index: trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/SolomonFormat/HombergerInstanceProvider.cs
===================================================================
--- trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/SolomonFormat/HombergerInstanceProvider.cs	(revision 11623)
+++ trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/SolomonFormat/HombergerInstanceProvider.cs	(revision 11650)
@@ -21,10 +21,4 @@
 
 using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Reflection;
-using System.Text.RegularExpressions;
-using ICSharpCode.SharpZipLib.Zip;
 
 namespace HeuristicLab.Problems.Instances.VehicleRouting {
Index: trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/SolomonFormat/SolomonInstanceProvider.cs
===================================================================
--- trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/SolomonFormat/SolomonInstanceProvider.cs	(revision 11623)
+++ trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/SolomonFormat/SolomonInstanceProvider.cs	(revision 11650)
@@ -21,10 +21,4 @@
 
 using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Reflection;
-using System.Text.RegularExpressions;
-using ICSharpCode.SharpZipLib.Zip;
 
 namespace HeuristicLab.Problems.Instances.VehicleRouting {
@@ -37,5 +31,5 @@
       get { return "Solomon test set"; }
     }
-    
+
     public override Uri WebLink {
       get { return new Uri(@"http://web.cba.neu.edu/~msolomon/problems.htm"); }
Index: trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/TSPLibFormat/AugeratInstanceProvider.cs
===================================================================
--- trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/TSPLibFormat/AugeratInstanceProvider.cs	(revision 11623)
+++ trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/TSPLibFormat/AugeratInstanceProvider.cs	(revision 11650)
@@ -21,10 +21,4 @@
 
 using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Reflection;
-using System.Text.RegularExpressions;
-using ICSharpCode.SharpZipLib.Zip;
 
 namespace HeuristicLab.Problems.Instances.VehicleRouting {
@@ -37,5 +31,5 @@
       get { return "Augerat test set"; }
     }
-    
+
     public override Uri WebLink {
       get { return new Uri(@"http://www.branchandcut.org/VRP/data"); }
Index: trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/TSPLibFormat/ChristofidesEilonInstanceProvider.cs
===================================================================
--- trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/TSPLibFormat/ChristofidesEilonInstanceProvider.cs	(revision 11623)
+++ trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/TSPLibFormat/ChristofidesEilonInstanceProvider.cs	(revision 11650)
@@ -21,10 +21,4 @@
 
 using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Reflection;
-using System.Text.RegularExpressions;
-using ICSharpCode.SharpZipLib.Zip;
 
 namespace HeuristicLab.Problems.Instances.VehicleRouting {
@@ -37,5 +31,5 @@
       get { return "Christofides and Eilon test set"; }
     }
-    
+
     public override Uri WebLink {
       get { return new Uri(@"http://www.branchandcut.org/VRP/data"); }
Index: trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/TaillardFormat/TaillardInstanceProvider.cs
===================================================================
--- trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/TaillardFormat/TaillardInstanceProvider.cs	(revision 11623)
+++ trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/TaillardFormat/TaillardInstanceProvider.cs	(revision 11650)
@@ -21,10 +21,4 @@
 
 using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Reflection;
-using System.Text.RegularExpressions;
-using ICSharpCode.SharpZipLib.Zip;
 
 namespace HeuristicLab.Problems.Instances.VehicleRouting {
@@ -37,5 +31,5 @@
       get { return "Taillard test set"; }
     }
-    
+
     public override Uri WebLink {
       get { return new Uri(@"http://mistic.heig-vd.ch/taillard/problemes.dir/vrp.dir/vrp.html"); }
Index: trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/VRPInstanceProvider.cs
===================================================================
--- trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/VRPInstanceProvider.cs	(revision 11623)
+++ trunk/sources/HeuristicLab.Problems.Instances.VehicleRouting/3.4/VRPInstanceProvider.cs	(revision 11650)
@@ -23,9 +23,9 @@
 using System.Collections.Generic;
 using System.IO;
+using System.IO.Compression;
 using System.Linq;
 using System.Reflection;
 using System.Text.RegularExpressions;
 using HeuristicLab.Common;
-using ICSharpCode.SharpZipLib.Zip;
 
 namespace HeuristicLab.Problems.Instances.VehicleRouting {
@@ -37,7 +37,7 @@
       var solutionsArchiveName = GetResourceName(FileName + @"\.opt\.zip");
       if (!String.IsNullOrEmpty(solutionsArchiveName)) {
-        using (var solutionsZipFile = new ZipInputStream(GetType().Assembly.GetManifestResourceStream(solutionsArchiveName))) {
-          foreach (var entry in GetZipContents(solutionsZipFile))
-            solutions.Add(Path.GetFileNameWithoutExtension(entry) + "." + FileName, entry);
+        using (var solutionsZipFile = new ZipArchive(GetType().Assembly.GetManifestResourceStream(solutionsArchiveName), ZipArchiveMode.Read)) {
+          foreach (var entry in solutionsZipFile.Entries)
+            solutions.Add(Path.GetFileNameWithoutExtension(entry.Name) + "." + FileName, entry.Name);
         }
       }
@@ -45,6 +45,6 @@
       if (String.IsNullOrEmpty(instanceArchiveName)) yield break;
 
-      using (var instanceStream = new ZipInputStream(GetType().Assembly.GetManifestResourceStream(instanceArchiveName))) {
-        foreach (var entry in GetZipContents(instanceStream).OrderBy(x => x, new NaturalStringComparer())) {
+      using (var instanceStream = new ZipArchive(GetType().Assembly.GetManifestResourceStream(instanceArchiveName), ZipArchiveMode.Read)) {
+        foreach (var entry in instanceStream.Entries.Select(x => x.Name).OrderBy(x => x, new NaturalStringComparer())) {
           string solutionEntry = Path.GetFileNameWithoutExtension(entry) + "." + FileName;
           yield return new VRPDataDescriptor(Path.GetFileNameWithoutExtension(entry), GetInstanceDescription(), entry, solutions.ContainsKey(solutionEntry) ? solutions[solutionEntry] : String.Empty);
@@ -56,7 +56,7 @@
       var descriptor = (VRPDataDescriptor)id;
       var instanceArchiveName = GetResourceName(FileName + @"\.zip");
-      using (var instancesZipFile = new ZipFile(GetType().Assembly.GetManifestResourceStream(instanceArchiveName))) {
+      using (var instancesZipFile = new ZipArchive(GetType().Assembly.GetManifestResourceStream(instanceArchiveName))) {
         var entry = instancesZipFile.GetEntry(descriptor.InstanceIdentifier);
-        var stream = instancesZipFile.GetInputStream(entry);
+        var stream = entry.Open();
         var instance = LoadData(stream);
         if (string.IsNullOrEmpty(instance.Name)) {
@@ -66,7 +66,7 @@
         if (!String.IsNullOrEmpty(descriptor.SolutionIdentifier)) {
           var solutionsArchiveName = GetResourceName(FileName + @"\.opt\.zip");
-          using (var solutionsZipFile = new ZipFile(GetType().Assembly.GetManifestResourceStream(solutionsArchiveName))) {
+          using (var solutionsZipFile = new ZipArchive(GetType().Assembly.GetManifestResourceStream(solutionsArchiveName))) {
             entry = solutionsZipFile.GetEntry(descriptor.SolutionIdentifier);
-            stream = solutionsZipFile.GetInputStream(entry);
+            stream = entry.Open();
             LoadSolution(stream, instance);
           }
@@ -130,5 +130,6 @@
           LoadSolution(stream, instance);
         }
-      } catch (Exception) {
+      }
+      catch (Exception) {
         // new stream necessary because first try already read from stream
         using (var stream = new FileStream(path, FileMode.Open)) {
@@ -149,11 +150,4 @@
       return "Embedded instance of plugin version " + Assembly.GetExecutingAssembly().GetCustomAttributes(typeof(AssemblyFileVersionAttribute), true).Cast<AssemblyFileVersionAttribute>().First().Version + ".";
     }
-
-    protected IEnumerable<string> GetZipContents(ZipInputStream zipFile) {
-      ZipEntry entry;
-      while ((entry = zipFile.GetNextEntry()) != null) {
-        yield return entry.Name;
-      }
-    }
     #endregion
   }
