diff --git a/src/dotnet/FileSystem.cs b/src/dotnet/FileSystem.cs
index 8b41a279..dff4662d 100644
--- a/src/dotnet/FileSystem.cs
+++ b/src/dotnet/FileSystem.cs
@@ -201,6 +201,22 @@ namespace Fsp
             FileAttributes = default(UInt32);
             return STATUS_INVALID_DEVICE_REQUEST;
         }
+        protected virtual Int32 Create(
+            String FileName,
+            UInt32 CreateOptions,
+            UInt32 GrantedAccess,
+            UInt32 FileAttributes,
+            Object SecurityDescriptor,
+            UInt64 AllocationSize,
+            out Object FileNode,
+            out Object FileDesc,
+            out FileInfo FileInfo)
+        {
+            FileNode = default(Object);
+            FileDesc = default(Object);
+            FileInfo = default(FileInfo);
+            return STATUS_INVALID_DEVICE_REQUEST;
+        }
 
         /* FSP_FILE_SYSTEM_INTERFACE */
         private static Object SecurityDescriptorNotNull = new Object();
@@ -243,24 +259,24 @@ namespace Fsp
             IntPtr PSecurityDescriptorSize)
         {
             FileSystem self = (FileSystem)Api.FspFileSystemGetUserContext(FileSystem);
-            UInt32 FileAttributes;
-            Object SecurityDescriptorObject = null;
-            Int32 Result;
             try
             {
+                UInt32 FileAttributes;
+                Object SecurityDescriptorObject = null;
+                Int32 Result;
                 if (IntPtr.Zero != PSecurityDescriptorSize)
                     SecurityDescriptorObject = SecurityDescriptorNotNull;
                 Result = self.GetSecurityByName(FileName,
                     out FileAttributes, ref SecurityDescriptorObject);
+                if (IntPtr.Zero != PFileAttributes)
+                    Marshal.WriteInt32(PFileAttributes, (Int32)FileAttributes);
+                return Api.CopySecurityDescriptor(SecurityDescriptorObject,
+                    SecurityDescriptor, PSecurityDescriptorSize);
             }
             catch (Exception ex)
             {
                 return self.ExceptionHandler(ex);
             }
-            if (IntPtr.Zero != PFileAttributes)
-                Marshal.WriteInt32(PFileAttributes, (Int32)FileAttributes);
-            return Api.CopySecurityDescriptor(SecurityDescriptorObject,
-                SecurityDescriptor, PSecurityDescriptorSize);
         }
         private static Int32 Create(
             IntPtr FileSystem,
@@ -273,9 +289,30 @@ namespace Fsp
             out FullContext FullContext,
             out FileInfo FileInfo)
         {
-            FullContext = default(FullContext);
-            FileInfo = default(FileInfo);
-            return STATUS_INVALID_DEVICE_REQUEST;
+            FileSystem self = (FileSystem)Api.FspFileSystemGetUserContext(FileSystem);
+            try
+            {
+                Object FileNode, FileDesc;
+                Int32 Result;
+                Result = self.Create(
+                    FileName,
+                    CreateOptions,
+                    GrantedAccess,
+                    FileAttributes,
+                    Api.MakeSecurityDescriptor(SecurityDescriptor),
+                    AllocationSize,
+                    out FileNode,
+                    out FileDesc,
+                    out FileInfo);
+                Api.SetFullContext(out FullContext, FileNode, FileDesc);
+                return Result;
+            }
+            catch (Exception ex)
+            {
+                FullContext = default(FullContext);
+                FileInfo = default(FileInfo);
+                return self.ExceptionHandler(ex);
+            }
         }
         private static Int32 Open(
             IntPtr FileSystem,
diff --git a/src/dotnet/Interop.cs b/src/dotnet/Interop.cs
index c083848b..8b5aae1c 100644
--- a/src/dotnet/Interop.cs
+++ b/src/dotnet/Interop.cs
@@ -118,26 +118,26 @@ namespace Fsp.Interop
     }
 
     [StructLayout(LayoutKind.Sequential)]
-    internal struct FileInfo
+    public struct FileInfo
     {
-        internal UInt32 FileAttributes;
-        internal UInt32 ReparseTag;
-        internal UInt64 AllocationSize;
-        internal UInt64 FileSize;
-        internal UInt64 CreationTime;
-        internal UInt64 LastAccessTime;
-        internal UInt64 LastWriteTime;
-        internal UInt64 ChangeTime;
-        internal UInt64 IndexNumber;
-        internal UInt32 HardLinks;
+        public UInt32 FileAttributes;
+        public UInt32 ReparseTag;
+        public UInt64 AllocationSize;
+        public UInt64 FileSize;
+        public UInt64 CreationTime;
+        public UInt64 LastAccessTime;
+        public UInt64 LastWriteTime;
+        public UInt64 ChangeTime;
+        public UInt64 IndexNumber;
+        public UInt32 HardLinks;
     }
 
     [StructLayout(LayoutKind.Sequential)]
-    internal struct OpenFileInfo
+    public struct OpenFileInfo
     {
-        internal FileInfo FileInfo;
-        internal IntPtr NormalizedName;
-        internal UInt16 NormalizedNameSize;
+        public FileInfo FileInfo;
+        public IntPtr NormalizedName;
+        public UInt16 NormalizedNameSize;
     }
 
     [StructLayout(LayoutKind.Sequential)]
@@ -150,7 +150,7 @@ namespace Fsp.Interop
     }
 
     [StructLayout(LayoutKind.Sequential)]
-    struct StreamInfo
+    internal struct StreamInfo
     {
         internal UInt16 Size;
         internal UInt64 StreamSize;
@@ -159,7 +159,7 @@ namespace Fsp.Interop
     }
 
     [StructLayout(LayoutKind.Sequential)]
-    struct FullContext
+    internal struct FullContext
     {
         internal UInt64 UserContext;
         internal UInt64 UserContext2;
@@ -465,6 +465,21 @@ namespace Fsp.Interop
                 }
             }
         }
+
+        internal static void GetFullContext(ref FullContext FullContext,
+            out Object FileNode, out Object FileDesc)
+        {
+            FileNode = default(Object);
+            FileDesc = default(Object);
+        }
+        internal static void SetFullContext(out FullContext FullContext,
+            Object FileNode, Object FileDesc)
+        {
+            FullContext = default(FullContext);
+        }
+
+        [DllImport("advapi32.dll", CallingConvention = CallingConvention.StdCall)]
+        private static extern UInt32 GetSecurityDescriptorLength(IntPtr SecurityDescriptor);
         internal static Int32 CopySecurityDescriptor(
             Object SecurityDescriptorObject,
             IntPtr SecurityDescriptor,
@@ -486,7 +501,7 @@ namespace Fsp.Interop
                     {
                         byte[] Bytes = new byte[GenericSecurityDescriptor.BinaryLength];
                         GenericSecurityDescriptor.GetBinaryForm(Bytes, 0);
-                        Marshal.Copy(Bytes, 0, SecurityDescriptor, GenericSecurityDescriptor.BinaryLength);
+                        Marshal.Copy(Bytes, 0, SecurityDescriptor, Bytes.Length);
                     }
                 }
                 else
@@ -494,6 +509,18 @@ namespace Fsp.Interop
             }
             return 0/*STATUS_SUCCESS*/;
         }
+        internal static Object MakeSecurityDescriptor(
+            IntPtr SecurityDescriptor)
+        {
+            if (IntPtr.Zero != SecurityDescriptor)
+            {
+                byte[] Bytes = new byte[GetSecurityDescriptorLength(SecurityDescriptor)];
+                Marshal.Copy(SecurityDescriptor, Bytes, 0, Bytes.Length);
+                return new RawSecurityDescriptor(Bytes, 0);
+            }
+            else
+                return null;
+        }
 
         /* initialization */
         [DllImport("kernel32.dll", CallingConvention = CallingConvention.StdCall, SetLastError = true)]