diff --git a/src/LibHac/IO/AesXtsFile.cs b/src/LibHac/IO/AesXtsFile.cs
index f054193c..bc42f831 100644
--- a/src/LibHac/IO/AesXtsFile.cs
+++ b/src/LibHac/IO/AesXtsFile.cs
@@ -72,6 +72,8 @@ namespace LibHac.IO
 
         public override void SetSize(long size)
         {
+            Header.SetSize(size, VerificationKey);
+
             throw new NotImplementedException();
         }
     }
diff --git a/src/LibHac/IO/AesXtsFileHeader.cs b/src/LibHac/IO/AesXtsFileHeader.cs
index 3d72827b..58d8f8d9 100644
--- a/src/LibHac/IO/AesXtsFileHeader.cs
+++ b/src/LibHac/IO/AesXtsFileHeader.cs
@@ -13,7 +13,7 @@ namespace LibHac.IO
         public uint Magic { get; }
         public byte[] EncryptedKey1 { get; } = new byte[0x10];
         public byte[] EncryptedKey2 { get; } = new byte[0x10];
-        public long Size { get; }
+        public long Size { get; private set; }
 
         public byte[] DecryptedKey1 { get; } = new byte[0x10];
         public byte[] DecryptedKey2 { get; } = new byte[0x10];
@@ -63,6 +63,12 @@ namespace LibHac.IO
             return Util.ArraysEqual(hmac, Signature);
         }
 
+        public void SetSize(long size, byte[] verificationKey)
+        {
+            Size = size;
+            Signature = CalculateHmac(verificationKey);
+        }
+
         private void DecryptKeys()
         {
             Crypto.DecryptEcb(Kek1, EncryptedKey1, DecryptedKey1, 0x10);
diff --git a/src/LibHac/IO/FileSystemExtensions.cs b/src/LibHac/IO/FileSystemExtensions.cs
index 1c509f45..553b8667 100644
--- a/src/LibHac/IO/FileSystemExtensions.cs
+++ b/src/LibHac/IO/FileSystemExtensions.cs
@@ -35,7 +35,7 @@ namespace LibHac.IO
                     destFs.CreateFile(subDstPath, entry.Size, options);
 
                     using (IFile srcFile = sourceFs.OpenFile(subSrcPath, OpenMode.Read))
-                    using (IFile dstFile = destFs.OpenFile(subDstPath, OpenMode.Write))
+                    using (IFile dstFile = destFs.OpenFile(subDstPath, OpenMode.Write | OpenMode.Append))
                     {
                         logger?.LogMessage(subSrcPath);
                         srcFile.CopyTo(dstFile, logger);
diff --git a/src/LibHac/IO/LocalFileSystem.cs b/src/LibHac/IO/LocalFileSystem.cs
index 0eabad86..c665698e 100644
--- a/src/LibHac/IO/LocalFileSystem.cs
+++ b/src/LibHac/IO/LocalFileSystem.cs
@@ -6,9 +6,19 @@ namespace LibHac.IO
     {
         private string BasePath { get; }
 
+        /// <summary>
+        /// Opens a directory on local storage as an <see cref="IFileSystem"/>.
+        /// The directory will be created if it does not exist.
+        /// </summary>
+        /// <param name="basePath">The path that will be the root of the <see cref="LocalFileSystem"/>.</param>
         public LocalFileSystem(string basePath)
         {
             BasePath = Path.GetFullPath(basePath);
+
+            if (!Directory.Exists(BasePath))
+            {
+                Directory.CreateDirectory(BasePath);
+            }
         }
 
         internal string ResolveLocalPath(string path)
diff --git a/src/LibHac/NcaStructs.cs b/src/LibHac/NcaStructs.cs
index 7f059f76..07563588 100644
--- a/src/LibHac/NcaStructs.cs
+++ b/src/LibHac/NcaStructs.cs
@@ -268,13 +268,13 @@ namespace LibHac
         Control,
         Manual,
         Data,
-        AocData
+        PublicData
     }
 
     public enum DistributionType
     {
         Download,
-        Gamecard
+        GameCard
     }
 
     public enum NcaEncryptionType