diff --git a/src/dotnet/FileSystemBase.cs b/src/dotnet/FileSystemBase.cs
index 9ffc9564..84ea3dab 100644
--- a/src/dotnet/FileSystemBase.cs
+++ b/src/dotnet/FileSystemBase.cs
@@ -935,6 +935,37 @@ namespace Fsp
             StreamAllocationSize = default(UInt64);
             return false;
         }
+        /// <summary>
+        /// Gets directory information for a single file or directory within a parent directory.
+        /// </summary>
+        /// <param name="FileNode">
+        /// The file node of the parent directory.
+        /// </param>
+        /// <param name="FileDesc">
+        /// The file descriptor of the parent directory.
+        /// </param>
+        /// <param name="FileName">
+        /// The name of the file or directory to get information for. This name is relative
+        /// to the parent directory and is a single path component.
+        /// </param>
+        /// <param name="NormalizedName">
+        /// Receives the normalized name from the directory entry.
+        /// </param>
+        /// <param name="FileInfo">
+        /// Receives the file information.
+        /// </param>
+        /// <returns>STATUS_SUCCESS or error code.</returns>
+        public virtual Int32 GetDirInfoByName(
+            Object FileNode,
+            Object FileDesc,
+            String FileName,
+            out String NormalizedName,
+            out FileInfo FileInfo)
+        {
+            NormalizedName = default(String);
+            FileInfo = default(FileInfo);
+            return STATUS_INVALID_DEVICE_REQUEST;
+        }
 
         /* helpers */
         /// <summary>
diff --git a/src/dotnet/FileSystemHost.cs b/src/dotnet/FileSystemHost.cs
index e97023ec..8fb74ec6 100644
--- a/src/dotnet/FileSystemHost.cs
+++ b/src/dotnet/FileSystemHost.cs
@@ -189,6 +189,11 @@ namespace Fsp
             get { return 0 != (_VolumeParams.Flags & VolumeParams.PassQueryDirectoryPattern); }
             set { _VolumeParams.Flags |= (value ? VolumeParams.PassQueryDirectoryPattern : 0); }
         }
+        public Boolean PassQueryDirectoryFileName
+        {
+            get { return 0 != (_VolumeParams.Flags & VolumeParams.PassQueryDirectoryFileName); }
+            set { _VolumeParams.Flags |= (value ? VolumeParams.PassQueryDirectoryFileName : 0); }
+        }
         /// <summary>
         /// Gets or sets the prefix for a network file system.
         /// </summary>
@@ -987,6 +992,34 @@ namespace Fsp
                 return ExceptionHandler(FileSystem, ex);
             }
         }
+        private static Int32 GetDirInfoByName(
+            IntPtr FileSystemPtr,
+            ref FullContext FullContext,
+            String FileName,
+            out DirInfo DirInfo)
+        {
+            FileSystemBase FileSystem = (FileSystemBase)Api.GetUserContext(FileSystemPtr);
+            try
+            {
+                Object FileNode, FileDesc;
+                String NormalizedName;
+                Api.GetFullContext(ref FullContext, out FileNode, out FileDesc);
+                DirInfo = default(DirInfo);
+                Int32 Result = FileSystem.GetDirInfoByName(
+                    FileNode,
+                    FileDesc,
+                    FileName,
+                    out NormalizedName,
+                    out DirInfo.FileInfo);
+                DirInfo.SetFileNameBuf(NormalizedName);
+                return Result;
+            }
+            catch (Exception ex)
+            {
+                DirInfo = default(DirInfo);
+                return ExceptionHandler(FileSystem, ex);
+            }
+        }
 
         static FileSystemHost()
         {
@@ -1014,6 +1047,7 @@ namespace Fsp
             _FileSystemInterface.SetReparsePoint = SetReparsePoint;
             _FileSystemInterface.DeleteReparsePoint = DeleteReparsePoint;
             _FileSystemInterface.GetStreamInfo = GetStreamInfo;
+            _FileSystemInterface.GetDirInfoByName = GetDirInfoByName;
 
             _FileSystemInterfacePtr = Marshal.AllocHGlobal(FileSystemInterface.Size);
             Marshal.StructureToPtr(_FileSystemInterface, _FileSystemInterfacePtr, false);
diff --git a/src/dotnet/Interop.cs b/src/dotnet/Interop.cs
index 43eb6ded..43838240 100644
--- a/src/dotnet/Interop.cs
+++ b/src/dotnet/Interop.cs
@@ -42,6 +42,7 @@ namespace Fsp.Interop
         internal const UInt32 PostCleanupWhenModifiedOnly = 0x00000400;
         internal const UInt32 PassQueryDirectoryPattern = 0x00000800;
         internal const UInt32 AlwaysUseDoubleBuffering = 0x00001000;
+        internal const UInt32 PassQueryDirectoryFileName = 0x00002000;
         internal const UInt32 UmFileContextIsUserContext2 = 0x00010000;
         internal const UInt32 UmFileContextIsFullContext = 0x00020000;
         internal const int PrefixSize = 192;
@@ -450,6 +451,12 @@ namespace Fsp.Interop
                 IntPtr Buffer,
                 UInt32 Length,
                 out UInt32 PBytesTransferred);
+            [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
+            internal delegate Int32 GetDirInfoByName(
+                IntPtr FileSystem,
+                ref FullContext FullContext,
+                [MarshalAs(UnmanagedType.LPWStr)] String FileName,
+                out DirInfo DirInfo);
         }
 
         internal static int Size = IntPtr.Size * 64;
@@ -478,7 +485,8 @@ namespace Fsp.Interop
         internal Proto.SetReparsePoint SetReparsePoint;
         internal Proto.DeleteReparsePoint DeleteReparsePoint;
         internal Proto.GetStreamInfo GetStreamInfo;
-        /* NTSTATUS (*Reserved[40])(); */
+        internal Proto.GetDirInfoByName GetDirInfoByName;
+        /* NTSTATUS (*Reserved[39])(); */
     }
 
     [SuppressUnmanagedCodeSecurity]