diff --git a/GameRes/ArcFile.cs b/GameRes/ArcFile.cs
index 59633b79..73064e6d 100644
--- a/GameRes/ArcFile.cs
+++ b/GameRes/ArcFile.cs
@@ -143,6 +143,16 @@ namespace GameRes
             return m_interface.OpenEntry (this, entry);
         }
 
+        /// <summary>
+        /// Open specified <paramref name="entry"/> as memory-mapped view.
+        /// </summary>
+        public ArcView OpenView (Entry entry)
+        {
+            var stream = OpenEntry (entry);
+            uint size = stream.CanSeek ? (uint)stream.Length : entry.Size;
+            return new ArcView (stream, entry.Name, size);
+        }
+
         /// <summary>
         /// Open specified <paramref name="entry"/> as a seekable Stream.
         /// </summary>
@@ -168,6 +178,14 @@ namespace GameRes
             return ArchiveFormat.CreateFile (entry.Name);
         }
 
+        public IFileSystem CreateFileSystem ()
+        {
+            if (m_interface.IsHierarchic)
+                return new ArchiveFileSystem (this);
+            else
+                return new FlatArchiveFileSystem (this);
+        }
+
         #region IDisposable Members
         bool disposed = false;
 
diff --git a/GameRes/FileSystem.cs b/GameRes/FileSystem.cs
new file mode 100644
index 00000000..5bbb806a
--- /dev/null
+++ b/GameRes/FileSystem.cs
@@ -0,0 +1,303 @@
+//! \file       FileSystem.cs
+//! \date       Fri Jun 05 15:32:27 2015
+//! \brief      Gameres file system abstraction.
+//
+// Copyright (C) 2015 by morkt
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text.RegularExpressions;
+
+namespace GameRes
+{
+    public interface IFileSystem : IDisposable
+    {
+        /// <summary>
+        /// Open file for reading.
+        /// </summary>
+        Stream OpenStream (Entry entry);
+
+        ArcView OpenView (Entry entry);
+
+        /// <summary>
+        /// Enumerates subdirectories and files in current directory.
+        /// </summary>
+        IEnumerable<Entry> GetFiles ();
+
+        /// <summary>
+        /// Recursively enumerates files in the current directory and its subdirectories.
+        /// Subdirectory entries are omitted.
+        /// </summary>
+        IEnumerable<Entry> GetFilesRecursive ();
+
+        string CurrentDirectory { get; set; }
+    }
+
+    public class SubDirEntry : Entry
+    {
+        public override string Type  { get { return "directory"; } }
+
+        public SubDirEntry (string name)
+        {
+            Name = name;
+            Size = 0;
+        }
+    }
+
+    public class PhysicalFileSystem : IFileSystem
+    {
+        public string CurrentDirectory
+        {
+            get { return Directory.GetCurrentDirectory(); }
+            set { Directory.SetCurrentDirectory (value); }
+        }
+
+        public IEnumerable<Entry> GetFiles ()
+        {
+            var info = new DirectoryInfo (CurrentDirectory);
+            foreach (var subdir in info.EnumerateDirectories())
+            {
+                if (0 != (subdir.Attributes & (FileAttributes.Hidden | FileAttributes.System)))
+                    continue;
+                yield return new SubDirEntry (subdir.FullName);
+            }
+            foreach (var file in info.EnumerateFiles())
+            {
+                if (0 != (file.Attributes & (FileAttributes.Hidden | FileAttributes.System)))
+                    continue;
+                yield return EntryFromFileInfo (file);
+            }
+        }
+
+        public IEnumerable<Entry> GetFilesRecursive ()
+        {
+            var info = new DirectoryInfo (CurrentDirectory);
+            foreach (var file in info.EnumerateFiles ("*", SearchOption.AllDirectories))
+            {
+                if (0 != (file.Attributes & (FileAttributes.Hidden | FileAttributes.System)))
+                    continue;
+                yield return EntryFromFileInfo (file);
+            }
+        }
+
+        private Entry EntryFromFileInfo (FileInfo file)
+        {
+            var entry = FormatCatalog.Instance.CreateEntry (file.FullName);
+            entry.Size = (uint)Math.Min (file.Length, uint.MaxValue);
+            return entry;
+        }
+
+        public Stream OpenStream (Entry entry)
+        {
+            return File.OpenRead (entry.Name);
+        }
+
+        public ArcView OpenView (Entry entry)
+        {
+            return new ArcView (entry.Name);
+        }
+
+        public void Dispose ()
+        {
+            GC.SuppressFinalize (this);
+        }
+    }
+
+    public class FlatArchiveFileSystem : IFileSystem
+    {
+        protected ArcFile   m_arc;
+
+        public virtual string CurrentDirectory
+        {
+            get { return ""; }
+            set
+            {
+                if (string.IsNullOrEmpty (value))
+                    return;
+                if (".." == value || "." == value)
+                    return;
+                if ("\\" == value || "/" == value)
+                    return;
+                throw new DirectoryNotFoundException();
+            }
+        }
+
+        public FlatArchiveFileSystem (ArcFile arc)
+        {
+            m_arc = arc;
+        }
+
+        public Stream OpenStream (Entry entry)
+        {
+            return m_arc.OpenEntry (entry);
+        }
+
+        public ArcView OpenView (Entry entry)
+        {
+            return m_arc.OpenView (entry);
+        }
+
+        public virtual IEnumerable<Entry> GetFiles ()
+        {
+            return m_arc.Dir;
+        }
+
+        public virtual IEnumerable<Entry> GetFilesRecursive ()
+        {
+            return m_arc.Dir;
+        }
+
+        #region IDisposable Members
+        bool _arc_disposed = false;
+
+        public void Dispose ()
+        {
+            Dispose (true);
+            GC.SuppressFinalize (this);
+        }
+
+        protected virtual void Dispose (bool disposing)
+        {
+            if (!_arc_disposed)
+            {
+                if (disposing)
+                {
+                    m_arc.Dispose();
+                }
+                _arc_disposed = true;
+            }
+        }
+        #endregion
+    }
+
+    public class ArchiveFileSystem : FlatArchiveFileSystem
+    {
+        private string  m_cwd;
+
+        private string PathDelimiter { get; set; }
+
+        private static readonly char[] m_path_delimiters = { '/', '\\' };
+
+        public ArchiveFileSystem (ArcFile arc) : base (arc)
+        {
+            m_cwd = "";
+            PathDelimiter = "/";
+        }
+
+        public override string CurrentDirectory
+        {
+            get { return m_cwd; }
+            set { ChDir (value); }
+        }
+
+        static readonly Regex path_re = new Regex (@"\G[/\\]?([^/\\]+)([/\\])");
+
+        public override IEnumerable<Entry> GetFiles ()
+        {
+            var root_dir = "";
+            IEnumerable<Entry> dir = m_arc.Dir;
+            if (!string.IsNullOrEmpty (m_cwd))
+            {
+                root_dir = m_cwd+PathDelimiter;
+                dir = from entry in dir
+                      where entry.Name.StartsWith (root_dir)
+                      select entry;
+                if (!dir.Any())
+                {
+                    throw new DirectoryNotFoundException();
+                }
+            }
+            var subdirs = new HashSet<string>();
+            foreach (var entry in dir)
+            {
+                var match = path_re.Match (entry.Name, root_dir.Length);
+                if (match.Success)
+                {
+                    string name = match.Groups[1].Value;
+                    if (subdirs.Add (name))
+                    {
+                        PathDelimiter = match.Groups[2].Value;
+                        yield return new SubDirEntry (root_dir+name);
+                    }
+                }
+                else
+                {
+                    yield return entry;
+                }
+            }
+        }
+
+        public override IEnumerable<Entry> GetFilesRecursive ()
+        {
+            if (0 == m_cwd.Length)
+                return m_arc.Dir;
+            else
+                return from file in m_arc.Dir
+                       where file.Name.StartsWith (m_cwd + PathDelimiter)
+                       select file;
+        }
+
+        private void ChDir (string path)
+        {
+            if (string.IsNullOrEmpty (path))
+                return;
+            List<string> cur_dir;
+            if (-1 != Array.IndexOf (m_path_delimiters, path[0]))
+            {
+                path = path.TrimStart (m_path_delimiters);
+                cur_dir = new List<string>();
+            }
+            else
+            {
+                cur_dir = m_cwd.Split (m_path_delimiters).ToList();
+            }
+            var path_list = path.Split (m_path_delimiters);
+            foreach (var dir in path_list)
+            {
+                if ("." == dir)
+                {
+                    continue;
+                }
+                else if (".." == dir)
+                {
+                    if (0 == cur_dir.Count)
+                        continue;
+                    cur_dir.RemoveAt (cur_dir.Count-1);
+                }
+                else
+                {
+                    cur_dir.Add (dir);
+                }
+            }
+            string new_path = string.Join (PathDelimiter, cur_dir);
+            if (0 != new_path.Length)
+            {
+                var entry = m_arc.Dir.FirstOrDefault (e => e.Name.StartsWith (new_path + PathDelimiter));
+                if (null == entry)
+                    throw new DirectoryNotFoundException();
+            }
+            m_cwd = new_path;
+        }
+    }
+}
diff --git a/GameRes/GameRes.csproj b/GameRes/GameRes.csproj
index 6a9b0b26..59cbe9d2 100644
--- a/GameRes/GameRes.csproj
+++ b/GameRes/GameRes.csproj
@@ -57,6 +57,7 @@
     <Compile Include="ArcView.cs" />
     <Compile Include="Audio.cs" />
     <Compile Include="AudioWAV.cs" />
+    <Compile Include="FileSystem.cs" />
     <Compile Include="GameRes.cs" />
     <Compile Include="Image.cs" />
     <Compile Include="ImageBMP.cs" />
diff --git a/GameRes/Properties/AssemblyInfo.cs b/GameRes/Properties/AssemblyInfo.cs
index b27ba2fd..4d365e92 100644
--- a/GameRes/Properties/AssemblyInfo.cs
+++ b/GameRes/Properties/AssemblyInfo.cs
@@ -32,5 +32,5 @@ using System.Runtime.InteropServices;
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion ("1.0.5.6")]
-[assembly: AssemblyFileVersion ("1.0.5.6")]
+[assembly: AssemblyVersion ("1.1.0.7")]
+[assembly: AssemblyFileVersion ("1.1.0.7")]