diff --git a/src/LibHac/IO/SubdirectoryFileSystem.cs b/src/LibHac/IO/SubdirectoryFileSystem.cs
new file mode 100644
index 00000000..08a7199d
--- /dev/null
+++ b/src/LibHac/IO/SubdirectoryFileSystem.cs
@@ -0,0 +1,99 @@
+namespace LibHac.IO
+{
+    public class SubdirectoryFileSystem : IFileSystem
+    {
+        private string RootPath { get; }
+        private IFileSystem ParentFileSystem { get; }
+
+        private string ResolveFullPath(string path)
+        {
+            //todo
+            return RootPath + path;
+        }
+
+        public SubdirectoryFileSystem(IFileSystem fs, string rootPath)
+        {
+            ParentFileSystem = fs;
+            RootPath = PathTools.Normalize(rootPath);
+        }
+
+        public void CreateDirectory(string path)
+        {
+            path = PathTools.Normalize(path);
+
+            ParentFileSystem.CreateDirectory(ResolveFullPath(path));
+        }
+
+        public void CreateFile(string path, long size)
+        {
+            path = PathTools.Normalize(path);
+
+            ParentFileSystem.CreateFile(ResolveFullPath(path), size);
+        }
+
+        public void DeleteDirectory(string path)
+        {
+            path = PathTools.Normalize(path);
+
+            ParentFileSystem.DeleteDirectory(ResolveFullPath(path));
+        }
+
+        public void DeleteFile(string path)
+        {
+            path = PathTools.Normalize(path);
+
+            ParentFileSystem.DeleteFile(ResolveFullPath(path));
+        }
+
+        public IDirectory OpenDirectory(string path, OpenDirectoryMode mode)
+        {
+            path = PathTools.Normalize(path);
+
+            IDirectory baseDir = ParentFileSystem.OpenDirectory(ResolveFullPath(path), mode);
+
+            return new SubdirectoryFileSystemDirectory(this, baseDir, path, mode);
+        }
+
+        public IFile OpenFile(string path, OpenMode mode)
+        {
+            path = PathTools.Normalize(path);
+
+            return ParentFileSystem.OpenFile(ResolveFullPath(path), mode);
+        }
+
+        public void RenameDirectory(string srcPath, string dstPath)
+        {
+            srcPath = PathTools.Normalize(srcPath);
+            dstPath = PathTools.Normalize(dstPath);
+
+            ParentFileSystem.RenameDirectory(ResolveFullPath(srcPath), ResolveFullPath(dstPath));
+        }
+
+        public void RenameFile(string srcPath, string dstPath)
+        {
+            srcPath = PathTools.Normalize(srcPath);
+            dstPath = PathTools.Normalize(dstPath);
+
+            ParentFileSystem.RenameFile(ResolveFullPath(srcPath), ResolveFullPath(dstPath));
+        }
+
+        public bool DirectoryExists(string path)
+        {
+            path = PathTools.Normalize(path);
+
+            return ParentFileSystem.DirectoryExists(ResolveFullPath(path));
+        }
+
+        public bool FileExists(string path)
+        {
+            path = PathTools.Normalize(path);
+
+            return ParentFileSystem.FileExists(ResolveFullPath(path));
+        }
+
+        public void Commit()
+        {
+            ParentFileSystem.Commit();
+        }
+    }
+}
diff --git a/src/LibHac/IO/SubdirectoryFileSystemDirectory.cs b/src/LibHac/IO/SubdirectoryFileSystemDirectory.cs
new file mode 100644
index 00000000..e5d5fdbe
--- /dev/null
+++ b/src/LibHac/IO/SubdirectoryFileSystemDirectory.cs
@@ -0,0 +1,31 @@
+using System.Collections.Generic;
+
+namespace LibHac.IO
+{
+    public class SubdirectoryFileSystemDirectory : IDirectory
+    {
+        public SubdirectoryFileSystemDirectory(SubdirectoryFileSystem fs, IDirectory baseDir, string path, OpenDirectoryMode mode)
+        {
+            ParentFileSystem = fs;
+            BaseDirectory = baseDir;
+            FullPath = path;
+            Mode = mode;
+        }
+
+        public IFileSystem ParentFileSystem { get; }
+        public string FullPath { get; }
+        public OpenDirectoryMode Mode { get; }
+
+        private IDirectory BaseDirectory { get; }
+
+        public IEnumerable<DirectoryEntry> Read()
+        {
+            return BaseDirectory.Read();
+        }
+
+        public int GetEntryCount()
+        {
+            return BaseDirectory.GetEntryCount();
+        }
+    }
+}