diff --git a/Source/SharpNeedle/Framework/Ninja/Csd/Cast.cs b/Source/SharpNeedle/Framework/Ninja/Csd/Cast.cs
index 2426f2f..ebe01db 100644
--- a/Source/SharpNeedle/Framework/Ninja/Csd/Cast.cs
+++ b/Source/SharpNeedle/Framework/Ninja/Csd/Cast.cs
@@ -66,7 +66,15 @@ public void Read(BinaryObjectReader reader, Family family)
         Info = reader.ReadObjectOffset<CastInfo>();
         InheritanceFlags = reader.Read<BitSet<uint>>();
         MaterialFlags = reader.Read<BitSet<uint>>();
-        SpriteIndices = reader.ReadArrayOffset<int>(reader.Read<int>());
+
+        if (reader.OffsetBinaryFormat == OffsetBinaryFormat.U64)
+        {
+            SpriteIndices = reader.ReadArrayOffset<int>((int)reader.Read<ulong>());
+        }
+        else
+        {
+            SpriteIndices = reader.ReadArrayOffset<int>(reader.Read<int>());
+        }
 
         Text = reader.ReadStringOffset();
         FontName = reader.ReadStringOffset();
diff --git a/Source/SharpNeedle/Framework/Ninja/Csd/CastInfoTable.cs b/Source/SharpNeedle/Framework/Ninja/Csd/CastInfoTable.cs
index aac7cb9..0b2393e 100644
--- a/Source/SharpNeedle/Framework/Ninja/Csd/CastInfoTable.cs
+++ b/Source/SharpNeedle/Framework/Ninja/Csd/CastInfoTable.cs
@@ -4,7 +4,8 @@ public class CastInfoTable : List<(string? Name, int FamilyIdx, int CastIdx)>, I
 {
     public void Read(BinaryObjectReader reader)
     {
-        int count = reader.Read<int>();
+        // FYI: this is not an offset, this is just to read it as a long or int based on the format
+        long count = reader.ReadOffsetValue();
         if (count == 0)
         {
             reader.Skip(reader.GetOffsetSize());
@@ -35,7 +36,7 @@ public void Write(BinaryObjectWriter writer)
         {
             foreach ((string? Name, int FamilyIdx, int CastIdx) in this)
             {
-                writer.WriteOffset(() => 
+                writer.WriteOffset(() =>
                 {
                     writer.WriteString(StringBinaryFormat.NullTerminated, Name);
                     writer.Write<byte>(0);
diff --git a/Source/SharpNeedle/Framework/Ninja/Csd/CsdDictionary.cs b/Source/SharpNeedle/Framework/Ninja/Csd/CsdDictionary.cs
index 75bbe5e..3508ed0 100644
--- a/Source/SharpNeedle/Framework/Ninja/Csd/CsdDictionary.cs
+++ b/Source/SharpNeedle/Framework/Ninja/Csd/CsdDictionary.cs
@@ -72,15 +72,16 @@ public bool Remove(KeyValuePair<string?, T> item)
 
     public void Read(BinaryObjectReader reader)
     {
-        int count = reader.Read<int>();
+        // FYI: this is not an offset, this is just to read it as a long or int based on the format
+        long count = reader.ReadOffsetValue();
         if (count == 0)
         {
             reader.Skip(reader.GetOffsetSize() * 2);
             return;
         }
 
-        Items.AddRange(reader.ReadObjectArrayOffset<T>(count));
-        NameTable.AddRange(reader.ReadObjectArrayOffset<NameIndexPair>(count));
+        Items.AddRange(reader.ReadObjectArrayOffset<T>((int)count));
+        NameTable.AddRange(reader.ReadObjectArrayOffset<NameIndexPair>((int)count));
     }
 
     public void Write(BinaryObjectWriter writer)
@@ -232,14 +233,15 @@ public NameIndexPair(string? name, int idx)
         public void Read(BinaryObjectReader reader)
         {
             Name = reader.ReadStringOffset();
-            Index = reader.Read<int>();
+            // FYI: this is not an offset, this is just to read it as a long or int based on the format
+            Index = (int)reader.ReadOffsetValue();
         }
 
         public void Write(BinaryObjectWriter writer)
         {
             string? name = Name;
 
-            writer.WriteOffset(() => 
+            writer.WriteOffset(() =>
             {
                 writer.WriteString(StringBinaryFormat.NullTerminated, name);
                 writer.Write<byte>(0);
diff --git a/Source/SharpNeedle/Framework/Ninja/Csd/CsdProject.cs b/Source/SharpNeedle/Framework/Ninja/Csd/CsdProject.cs
index 35a586f..dce252d 100644
--- a/Source/SharpNeedle/Framework/Ninja/Csd/CsdProject.cs
+++ b/Source/SharpNeedle/Framework/Ninja/Csd/CsdProject.cs
@@ -37,6 +37,7 @@ public void Read(BinaryObjectReader reader)
                 continue;
             Stream stream = Package.GetStream(i);
             using BinaryObjectReader infoReader = new(stream, StreamOwnership.Transfer, Package.Endianness);
+            infoReader.OffsetBinaryFormat = reader.OffsetBinaryFormat;
             try
             {
                 InfoChunk info = infoReader.ReadObject<InfoChunk, ChunkBinaryOptions>(options);
diff --git a/Source/SharpNeedle/Framework/Ninja/Csd/Family.cs b/Source/SharpNeedle/Framework/Ninja/Csd/Family.cs
index bdfa338..2888a06 100644
--- a/Source/SharpNeedle/Framework/Ninja/Csd/Family.cs
+++ b/Source/SharpNeedle/Framework/Ninja/Csd/Family.cs
@@ -21,7 +21,9 @@ public void AttachMotion(FamilyMotion motion)
     public void Read(BinaryObjectReader reader, Scene context)
     {
         Scene = context;
-        int castCount = reader.Read<int>();
+        // FYI: this is not an offset
+        int castCount = (int)reader.ReadOffsetValue();
+        
         CastBuffer = new List<Cast>(castCount);
         reader.ReadOffset(() =>
         {
@@ -31,7 +33,8 @@ public void Read(BinaryObjectReader reader, Scene context)
             }
         });
 
-        int root = reader.Read<int>();
+        // FYI: this is not an offset
+        int root = (int)reader.ReadOffsetValue();
         TreeDescriptorNode[] tree = reader.ReadArrayOffset<TreeDescriptorNode>(CastBuffer.Count);
         if (CastBuffer.Count != 0)
         {
diff --git a/Source/SharpNeedle/Framework/Ninja/Csd/Motions/CastMotion.cs b/Source/SharpNeedle/Framework/Ninja/Csd/Motions/CastMotion.cs
index e2d36cd..0274b35 100644
--- a/Source/SharpNeedle/Framework/Ninja/Csd/Motions/CastMotion.cs
+++ b/Source/SharpNeedle/Framework/Ninja/Csd/Motions/CastMotion.cs
@@ -18,7 +18,15 @@ public CastMotion(Cast cast)
     public void Read(BinaryObjectReader reader)
     {
         Clear();
-        Flags = reader.Read<BitSet<uint>>();
+        if (reader.OffsetBinaryFormat == OffsetBinaryFormat.U64)
+        {
+            Flags = (BitSet<uint>)reader.Read<BitSet<long>>().Value;
+        }
+        else
+        {
+            Flags = reader.Read<BitSet<uint>>();
+        }
+
         int count = Flags.PopCount();
 
         if (count == 0)
diff --git a/Source/SharpNeedle/Framework/Ninja/Csd/Motions/KeyFrame.cs b/Source/SharpNeedle/Framework/Ninja/Csd/Motions/KeyFrame.cs
index 9cb19a2..8d893ea 100644
--- a/Source/SharpNeedle/Framework/Ninja/Csd/Motions/KeyFrame.cs
+++ b/Source/SharpNeedle/Framework/Ninja/Csd/Motions/KeyFrame.cs
@@ -16,7 +16,15 @@ public void Read(BinaryObjectReader reader)
     {
         Frame = reader.Read<int>();
         Value = reader.Read<uint>();
-        Interpolation = reader.Read<InterpolationType>();
+        if (reader.OffsetBinaryFormat == OffsetBinaryFormat.U64)
+        {
+            Interpolation = (InterpolationType)reader.Read<uint>();
+        }
+        else
+        {
+            Interpolation = reader.Read<InterpolationType>();
+        }
+
         InTangent = reader.Read<float>();
         OutTangent = reader.Read<float>();
         Field14 = reader.Read<uint>();
@@ -26,7 +34,10 @@ public void Write(BinaryObjectWriter writer)
     {
         writer.Write(Frame);
         writer.Write(Value.Uint);
-        writer.Write(Interpolation);
+        if(writer.OffsetBinaryFormat == OffsetBinaryFormat.U64)
+            writer.Write((uint)Interpolation);
+        else
+            writer.Write(Interpolation);
         writer.Write(InTangent);
         writer.Write(OutTangent);
         writer.Write(Field14);
diff --git a/Source/SharpNeedle/Framework/Ninja/Csd/Scene.cs b/Source/SharpNeedle/Framework/Ninja/Csd/Scene.cs
index ac9bd33..ba1c407 100644
--- a/Source/SharpNeedle/Framework/Ninja/Csd/Scene.cs
+++ b/Source/SharpNeedle/Framework/Ninja/Csd/Scene.cs
@@ -22,9 +22,11 @@ public void Read(BinaryObjectReader reader)
         float motionBegin = reader.Read<float>();
         float motionEnd = reader.Read<float>();
         Textures = new List<Vector2>(reader.ReadArrayOffset<Vector2>(reader.Read<int>()));
-        Sprites = new List<Sprite>(reader.ReadArrayOffset<Sprite>(reader.Read<int>()));
+        // The ReadOffsetValue call is not for an offset
+        Sprites = new List<Sprite>(reader.ReadArrayOffset<Sprite>((int)reader.ReadOffsetValue()));
 
-        int familyCount = reader.Read<int>();
+        // FYI: this is not an offset
+        int familyCount = (int)reader.ReadOffsetValue();
         Families = new List<Family>(familyCount);
         reader.ReadOffset(() =>
         {
@@ -51,6 +53,12 @@ public void Read(BinaryObjectReader reader)
         if (Version >= 1)
         {
             AspectRatio = reader.Read<float>();
+
+            //This is the only "new" field in x64 CSD files, is this alignment/padding, or is this a new field?
+            if (reader.OffsetBinaryFormat == OffsetBinaryFormat.U64)
+            {
+                reader.Read<uint>();
+            }
         }
 
         if (Version >= 2)
diff --git a/Source/SharpNeedle/Framework/Ninja/Csd/TextureMirage.cs b/Source/SharpNeedle/Framework/Ninja/Csd/TextureMirage.cs
index bbb7a71..2a479d0 100644
--- a/Source/SharpNeedle/Framework/Ninja/Csd/TextureMirage.cs
+++ b/Source/SharpNeedle/Framework/Ninja/Csd/TextureMirage.cs
@@ -19,7 +19,8 @@ public TextureMirage(string name)
     public void Read(BinaryObjectReader reader)
     {
         Name = reader.ReadStringOffset();
-        MemoryDataIndex = reader.Read<int>();
+        // FYI: this is not an offset
+        MemoryDataIndex = (int)reader.ReadOffsetValue();
     }
 
     public void Write(BinaryObjectWriter writer)
diff --git a/Source/SharpNeedle/Framework/Ninja/InfoChunk.cs b/Source/SharpNeedle/Framework/Ninja/InfoChunk.cs
index 4f640a9..1138a60 100644
--- a/Source/SharpNeedle/Framework/Ninja/InfoChunk.cs
+++ b/Source/SharpNeedle/Framework/Ninja/InfoChunk.cs
@@ -23,7 +23,8 @@ public void Read(BinaryObjectReader reader, ChunkBinaryOptions options)
 
         Chunks.Clear();
         Chunks.Capacity = chunkCount;
-        reader.ReadOffset(() =>
+        uint offset = reader.ReadUInt32();
+        reader.ReadAtOffset(offset, () =>
         {
             reader.PushOffsetOrigin();
             for (int i = 0; i < chunkCount; i++)
@@ -56,7 +57,7 @@ public void Read(BinaryObjectReader reader, ChunkBinaryOptions options)
         });
 
         reader.Skip(4); // size of all chunks
-        Offsets = reader.ReadObjectOffset<OffsetChunk>();
+        Offsets = reader.ReadObjectAtOffset<OffsetChunk>(reader.ReadUInt32());
         reader.Skip(4); // Offsets.BinarySize
 
         Field1C = reader.Read<uint>();