diff --git a/src/LibHac/Fs/Fsa/IDirectory.cs b/src/LibHac/Fs/Fsa/IDirectory.cs
index 4207cd41..389a7109 100644
--- a/src/LibHac/Fs/Fsa/IDirectory.cs
+++ b/src/LibHac/Fs/Fsa/IDirectory.cs
@@ -6,8 +6,11 @@ namespace LibHac.Fs.Fsa;
 /// <summary>
 /// Provides an interface for enumerating the child entries of a directory.
 /// </summary>
+/// <remarks>Based on FS 13.1.0 (nnSdk 13.4.0)</remarks>
 public abstract class IDirectory : IDisposable
 {
+    public virtual void Dispose() { }
+
     /// <summary>
     /// Retrieves the next entries that this directory contains. Does not search subdirectories.
     /// </summary>
@@ -43,6 +46,4 @@ public abstract class IDirectory : IDisposable
 
     protected abstract Result DoRead(out long entriesRead, Span<DirectoryEntry> entryBuffer);
     protected abstract Result DoGetEntryCount(out long entryCount);
-
-    public virtual void Dispose() { }
-}
+}
\ No newline at end of file
diff --git a/src/LibHac/Fs/Fsa/IFile.cs b/src/LibHac/Fs/Fsa/IFile.cs
index c9417e07..dac96ba5 100644
--- a/src/LibHac/Fs/Fsa/IFile.cs
+++ b/src/LibHac/Fs/Fsa/IFile.cs
@@ -10,17 +10,20 @@ namespace LibHac.Fs.Fsa;
 /// </summary>
 /// <remarks><see cref="IFile"/> is similar to <see cref="IStorage"/>, and has a few main differences:
 /// 
-/// - <see cref="IFile"/> allows an <see cref="OpenMode"/> to be set that controls read, write
-/// and append permissions for the file.
+/// <para>- <see cref="IFile"/> allows an <see cref="OpenMode"/> to be set that controls read, write
+/// and append permissions for the file.</para>
 ///
-/// - If the <see cref="IFile"/> cannot read or write as many bytes as requested, it will read
-/// or write as many bytes as it can and return that number of bytes to the caller.
+/// <para>- If the <see cref="IFile"/> cannot read or write as many bytes as requested, it will read
+/// or write as many bytes as it can and return that number of bytes to the caller.</para>
 ///
-/// - If <see cref="Write"/> is called on an offset past the end of the <see cref="IFile"/>,
+/// <para>- If <see cref="Write"/> is called on an offset past the end of the <see cref="IFile"/>,
 /// the <see cref="OpenMode.AllowAppend"/> mode is set and the file supports expansion,
-/// the file will be expanded so that it is large enough to contain the written data.</remarks>
+/// the file will be expanded so that it is large enough to contain the written data.</para>
+/// <para>Based on FS 13.1.0 (nnSdk 13.4.0)</para></remarks>
 public abstract class IFile : IDisposable
 {
+    public virtual void Dispose() { }
+
     /// <summary>
     /// Reads a sequence of bytes from the current <see cref="IFile"/>.
     /// </summary>
@@ -174,15 +177,6 @@ public abstract class IFile : IDisposable
         return Result.Success;
     }
 
-    protected Result DrySetSize(long size, OpenMode openMode)
-    {
-        // Check that we can write.
-        if (!openMode.HasFlag(OpenMode.Write))
-            return ResultFs.WriteUnpermitted.Log();
-
-        return Result.Success;
-    }
-
     protected Result DryWrite(out bool needsAppend, long offset, long size, in WriteOption option,
         OpenMode openMode)
     {
@@ -196,6 +190,8 @@ public abstract class IFile : IDisposable
         Result rc = GetSize(out long fileSize);
         if (rc.IsFailure()) return rc;
 
+        needsAppend = false;
+
         if (fileSize < offset + size)
         {
             if (!openMode.HasFlag(OpenMode.AllowAppend))
@@ -203,10 +199,15 @@ public abstract class IFile : IDisposable
 
             needsAppend = true;
         }
-        else
-        {
-            needsAppend = false;
-        }
+
+        return Result.Success;
+    }
+
+    protected Result DrySetSize(long size, OpenMode openMode)
+    {
+        // Check that we can write.
+        if (!openMode.HasFlag(OpenMode.Write))
+            return ResultFs.WriteUnpermitted.Log();
 
         return Result.Success;
     }
@@ -218,6 +219,4 @@ public abstract class IFile : IDisposable
     protected abstract Result DoGetSize(out long size);
     protected abstract Result DoOperateRange(Span<byte> outBuffer, OperationId operationId, long offset, long size,
         ReadOnlySpan<byte> inBuffer);
-
-    public virtual void Dispose() { }
-}
+}
\ No newline at end of file
diff --git a/src/LibHac/Fs/Fsa/IFileSystem.cs b/src/LibHac/Fs/Fsa/IFileSystem.cs
index 913655b3..b405de69 100644
--- a/src/LibHac/Fs/Fsa/IFileSystem.cs
+++ b/src/LibHac/Fs/Fsa/IFileSystem.cs
@@ -8,8 +8,11 @@ namespace LibHac.Fs.Fsa;
 /// <summary>
 /// Provides an interface for accessing a file system. <c>/</c> is used as the path delimiter.
 /// </summary>
+/// <remarks>Based on FS 13.1.0 (nnSdk 13.4.0)</remarks>
 public abstract class IFileSystem : IDisposable
 {
+    public virtual void Dispose() { }
+
     /// <summary>
     /// Creates or overwrites a file at the specified path.
     /// </summary>
@@ -171,25 +174,22 @@ public abstract class IFileSystem : IDisposable
     }
 
     /// <summary>
-    /// Gets the amount of available free space on a drive, in bytes.
+    /// Opens an <see cref="IFile"/> instance for the specified path.
     /// </summary>
-    /// <param name="freeSpace">If the operation returns successfully, the amount of free space available on the drive, in bytes.</param>
-    /// <param name="path">The path of the drive to query. Unused in almost all cases.</param>
-    /// <returns>The <see cref="Result"/> of the requested operation.</returns>
-    public Result GetFreeSpaceSize(out long freeSpace, in Path path)
+    /// <param name="file">If the operation returns successfully,
+    /// An <see cref="IFile"/> instance for the specified path.</param>
+    /// <param name="path">The full path of the file to open.</param>
+    /// <param name="mode">Specifies the access permissions of the created <see cref="IFile"/>.</param>
+    /// <returns><see cref="Result.Success"/>: The operation was successful.<br/>
+    /// <see cref="ResultFs.PathNotFound"/>: The specified path does not exist or is a directory.<br/>
+    /// <see cref="ResultFs.TargetLocked"/>: When opening as <see cref="OpenMode.Write"/>,
+    /// the file is already opened as <see cref="OpenMode.Write"/>.</returns>
+    public Result OpenFile(ref UniqueRef<IFile> file, in Path path, OpenMode mode)
     {
-        return DoGetFreeSpaceSize(out freeSpace, in path);
-    }
+        if ((mode & OpenMode.ReadWrite) == 0 || (mode & ~OpenMode.All) != 0)
+            return ResultFs.InvalidModeForFileOpen.Log();
 
-    /// <summary>
-    /// Gets the total size of storage space on a drive, in bytes.
-    /// </summary>
-    /// <param name="totalSpace">If the operation returns successfully, the total size of the drive, in bytes.</param>
-    /// <param name="path">The path of the drive to query. Unused in almost all cases.</param>
-    /// <returns>The <see cref="Result"/> of the requested operation.</returns>
-    public Result GetTotalSpaceSize(out long totalSpace, in Path path)
-    {
-        return DoGetTotalSpaceSize(out totalSpace, in path);
+        return DoOpenFile(ref file, in path, mode);
     }
 
     /// <summary>
@@ -215,25 +215,6 @@ public abstract class IFileSystem : IDisposable
         return DoOpenFile(ref file, in pathNormalized, mode);
     }
 
-    /// <summary>
-    /// Opens an <see cref="IFile"/> instance for the specified path.
-    /// </summary>
-    /// <param name="file">If the operation returns successfully,
-    /// An <see cref="IFile"/> instance for the specified path.</param>
-    /// <param name="path">The full path of the file to open.</param>
-    /// <param name="mode">Specifies the access permissions of the created <see cref="IFile"/>.</param>
-    /// <returns><see cref="Result.Success"/>: The operation was successful.<br/>
-    /// <see cref="ResultFs.PathNotFound"/>: The specified path does not exist or is a directory.<br/>
-    /// <see cref="ResultFs.TargetLocked"/>: When opening as <see cref="OpenMode.Write"/>,
-    /// the file is already opened as <see cref="OpenMode.Write"/>.</returns>
-    public Result OpenFile(ref UniqueRef<IFile> file, in Path path, OpenMode mode)
-    {
-        if ((mode & OpenMode.ReadWrite) == 0 || (mode & ~OpenMode.All) != 0)
-            return ResultFs.InvalidModeForFileOpen.Log();
-
-        return DoOpenFile(ref file, in path, mode);
-    }
-
     /// <summary>
     /// Creates an <see cref="IDirectory"/> instance for enumerating the specified directory.
     /// </summary>
@@ -264,6 +245,28 @@ public abstract class IFileSystem : IDisposable
 
     public Result Flush() => DoFlush();
 
+    /// <summary>
+    /// Gets the amount of available free space on a drive, in bytes.
+    /// </summary>
+    /// <param name="freeSpace">If the operation returns successfully, the amount of free space available on the drive, in bytes.</param>
+    /// <param name="path">The path of the drive to query. Unused in almost all cases.</param>
+    /// <returns>The <see cref="Result"/> of the requested operation.</returns>
+    public Result GetFreeSpaceSize(out long freeSpace, in Path path)
+    {
+        return DoGetFreeSpaceSize(out freeSpace, in path);
+    }
+
+    /// <summary>
+    /// Gets the total size of storage space on a drive, in bytes.
+    /// </summary>
+    /// <param name="totalSpace">If the operation returns successfully, the total size of the drive, in bytes.</param>
+    /// <param name="path">The path of the drive to query. Unused in almost all cases.</param>
+    /// <returns>The <see cref="Result"/> of the requested operation.</returns>
+    public Result GetTotalSpaceSize(out long totalSpace, in Path path)
+    {
+        return DoGetTotalSpaceSize(out totalSpace, in path);
+    }
+
     /// <summary>
     /// Gets the creation, last accessed, and last modified timestamps of a file or directory.
     /// </summary>
@@ -333,8 +336,6 @@ public abstract class IFileSystem : IDisposable
 
     protected virtual Result DoQueryEntry(Span<byte> outBuffer, ReadOnlySpan<byte> inBuffer, QueryId queryId,
         in Path path) => ResultFs.NotImplemented.Log();
-
-    public virtual void Dispose() { }
 }
 
 /// <summary>
@@ -372,4 +373,4 @@ public enum QueryId
     UpdateMac = 1,
     IsSignedSystemPartitionOnSdCardValid = 2,
     QueryUnpreparedFileInformation = 3
-}
+}
\ No newline at end of file