diff --git a/SharpFileSystem.SharpZipLib/SharpZipLibFileSystem.cs b/SharpFileSystem.SharpZipLib/SharpZipLibFileSystem.cs
index ec215e3..fa982c8 100644
--- a/SharpFileSystem.SharpZipLib/SharpZipLibFileSystem.cs
+++ b/SharpFileSystem.SharpZipLib/SharpZipLibFileSystem.cs
@@ -4,6 +4,7 @@
 using System.Linq;
 using ICSharpCode.SharpZipLib.Zip;
 using SharpFileSystem.FileSystems;
+using SharpFileSystem.IO;
 
 namespace SharpFileSystem.SharpZipLib
 {
@@ -78,9 +79,29 @@ public bool Exists(FileSystemPath path)
 
         public Stream CreateFile(FileSystemPath path)
         {
+            return CreateFile(path,null);
+        }
+        public Stream CreateFile(FileSystemPath path, byte[] data)
+        {
+            BeginUpdate();
             var entry = new MemoryZipEntry();
             ZipFile.Add(entry, ToEntryPath(path));
-            return entry.GetSource();
+            var s = entry.GetSource();
+
+            if (data!=null) s.Write(data);
+
+            EndUpdate();
+            return s;
+        }
+        private void BeginUpdate()
+        {
+            if (!ZipFile.IsUpdating)
+                ZipFile.BeginUpdate();
+        }
+        private void EndUpdate()
+        {
+            if (ZipFile.IsUpdating)
+                ZipFile.CommitUpdate();
         }
 
         public Stream OpenFile(FileSystemPath path, FileAccess access)
@@ -92,12 +113,16 @@ public Stream OpenFile(FileSystemPath path, FileAccess access)
 
         public void CreateDirectory(FileSystemPath path)
         {
+            BeginUpdate();
             ZipFile.AddDirectory(ToEntryPath(path));
+            EndUpdate();
         }
 
         public void Delete(FileSystemPath path)
         {
+            BeginUpdate();
             ZipFile.Delete(ToEntryPath(path));
+            EndUpdate();
         }
 
         public class MemoryZipEntry: MemoryFileSystem.MemoryFile, IStaticDataSource
diff --git a/SharpFileSystem.Tests/SharpZipLib/SharpZipLibFileSystemTest.cs b/SharpFileSystem.Tests/SharpZipLib/SharpZipLibFileSystemTest.cs
index 1d3c543..6668af1 100644
--- a/SharpFileSystem.Tests/SharpZipLib/SharpZipLibFileSystemTest.cs
+++ b/SharpFileSystem.Tests/SharpZipLib/SharpZipLibFileSystemTest.cs
@@ -15,13 +15,14 @@ public class SharpZipLibFileSystemTest
     {
         private Stream zipStream;
         private SharpZipLibFileSystem fileSystem;
-
+        private MemoryStream memoryStream;
         [OneTimeSetUp]
         public void Initialize()
         {
-            var memoryStream = new MemoryStream();
+            memoryStream = new MemoryStream();
             zipStream = memoryStream;
             var zipOutput = new ZipOutputStream(zipStream);
+            zipOutput.UseZip64 = UseZip64.Off;
 
             var fileContentString = "this is a file";
             var fileContentBytes = Encoding.ASCII.GetBytes(fileContentString);
@@ -78,5 +79,24 @@ public void ExistsTest()
             Assert.IsFalse(fileSystem.Exists(FileSystemPath.Parse("/nonExistingDirectory/")));
             Assert.IsFalse(fileSystem.Exists(FileSystemPath.Parse("/directory/nonExistingFileInDirectory")));
         }
+
+        [Test]
+        public void CanCreateFileTest()
+        {
+            var text = "recent text";
+            var textBytes = Encoding.ASCII.GetBytes(text);
+            var fsp = FileSystemPath.Parse("/mostrecentfile.txt");
+            var fs = fileSystem.CreateFile(fsp, textBytes);
+            fs.Close();
+            Assert.IsTrue(fileSystem.Exists(fsp));
+
+            fs = fileSystem.OpenFile(fsp, FileAccess.Read);
+            var fsText = fs.ReadAllText();
+
+            Assert.IsTrue(fsText.Equals(text));
+
+            //delete the file we created, so as not to intefere with the other tests.
+            fileSystem.Delete(fsp);
+        }
     }
 }