diff --git a/AssetStudioFBX/AssetStudioFBX-x86.vcxproj.filters b/AssetStudioFBX/AssetStudioFBX-x86.vcxproj.filters
new file mode 100644
index 0000000..18ee756
--- /dev/null
+++ b/AssetStudioFBX/AssetStudioFBX-x86.vcxproj.filters
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="源文件">
+      <UniqueIdentifier>{583fcf27-d43a-4d07-86f5-7757c1fa471b}</UniqueIdentifier>
+      <Extensions>cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
+    </Filter>
+    <Filter Include="头文件">
+      <UniqueIdentifier>{444d070d-1fc6-4211-b76b-d4c5d708ac6f}</UniqueIdentifier>
+      <Extensions>h;hh;hpp;hxx;hm;inl;inc;ipp;xsd</Extensions>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="AssemblyInfo.cpp">
+      <Filter>源文件</Filter>
+    </ClCompile>
+    <ClCompile Include="AssetStudioFBX.cpp">
+      <Filter>源文件</Filter>
+    </ClCompile>
+    <ClCompile Include="AssetStudioFBXExporter.cpp">
+      <Filter>源文件</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="AssetStudioFBX.h">
+      <Filter>头文件</Filter>
+    </ClInclude>
+  </ItemGroup>
+</Project>
\ No newline at end of file
diff --git a/AssetStudioFBX/AssetStudioFBXExporter.cpp b/AssetStudioFBX/AssetStudioFBXExporter.cpp
index c3b52d6..cedc2e4 100644
--- a/AssetStudioFBX/AssetStudioFBXExporter.cpp
+++ b/AssetStudioFBX/AssetStudioFBXExporter.cpp
@@ -218,7 +218,7 @@ namespace AssetStudio
 			while (parent != nullptr)
 			{
 				exportFrames->Add(parent->Name);
-				parent = (ImportedFrame^)parent->Parent;
+				parent = parent->Parent;
 			}
 
 			List<ImportedBone^>^ boneList = meshListSome->BoneList;
@@ -232,7 +232,7 @@ namespace AssetStudio
 						while (boneParent != nullptr)
 						{
 							exportFrames->Add(boneParent->Name);
-							boneParent = (ImportedFrame^)boneParent->Parent;
+							boneParent = boneParent->Parent;
 						}
 					}
 				}
diff --git a/AssetStudioUtility/AssetStudioUtility.csproj b/AssetStudioUtility/AssetStudioUtility.csproj
index 2e04430..3d0a77b 100644
--- a/AssetStudioUtility/AssetStudioUtility.csproj
+++ b/AssetStudioUtility/AssetStudioUtility.csproj
@@ -43,7 +43,6 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Imported.cs" />
-    <Compile Include="ObjChildren.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
diff --git a/AssetStudioUtility/Imported.cs b/AssetStudioUtility/Imported.cs
index a48f156..64ee5dc 100644
--- a/AssetStudioUtility/Imported.cs
+++ b/AssetStudioUtility/Imported.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections;
 using System.Collections.Generic;
 using System.IO;
 using SharpDX;
@@ -15,11 +16,61 @@ namespace AssetStudio
         List<ImportedMorph> MorphList { get; }
     }
 
-    public class ImportedFrame : ObjChildren<ImportedFrame>, IObjChild
+    public class ImportedFrame : IEnumerable<ImportedFrame>
     {
         public string Name { get; set; }
         public Matrix Matrix { get; set; }
-        public dynamic Parent { get; set; }
+        public ImportedFrame Parent { get; set; }
+
+        private List<ImportedFrame> children;
+
+        public ImportedFrame this[int i] => children[i];
+
+        public int Count => children.Count;
+
+        public void InitChildren(int count)
+        {
+            children = new List<ImportedFrame>(count);
+        }
+
+        public void AddChild(ImportedFrame obj)
+        {
+            children.Add(obj);
+            obj.Parent = this;
+        }
+
+        public void InsertChild(int i, ImportedFrame obj)
+        {
+            children.Insert(i, obj);
+            obj.Parent = this;
+        }
+
+        public void RemoveChild(ImportedFrame obj)
+        {
+            obj.Parent = null;
+            children.Remove(obj);
+        }
+
+        public void RemoveChild(int i)
+        {
+            children[i].Parent = null;
+            children.RemoveAt(i);
+        }
+
+        public int IndexOf(ImportedFrame obj)
+        {
+            return children.IndexOf(obj);
+        }
+
+        public IEnumerator<ImportedFrame> GetEnumerator()
+        {
+            return children.GetEnumerator();
+        }
+
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            return GetEnumerator();
+        }
     }
 
     public class ImportedMesh
diff --git a/AssetStudioUtility/ObjChildren.cs b/AssetStudioUtility/ObjChildren.cs
deleted file mode 100644
index 4b90853..0000000
--- a/AssetStudioUtility/ObjChildren.cs
+++ /dev/null
@@ -1,65 +0,0 @@
-using System;
-using System.Collections;
-using System.Collections.Generic;
-using System.IO;
-
-namespace AssetStudio
-{
-    public interface IObjChild
-    {
-        dynamic Parent { get; set; }
-    }
-
-    public abstract class ObjChildren<T> : IEnumerable<T> where T : IObjChild
-    {
-        protected List<T> children;
-
-        public T this[int i] => children[i];
-
-        public int Count => children.Count;
-
-        public void InitChildren(int count)
-        {
-            children = new List<T>(count);
-        }
-
-        public void AddChild(T obj)
-        {
-            children.Add(obj);
-            obj.Parent = this;
-        }
-
-        public void InsertChild(int i, T obj)
-        {
-            children.Insert(i, obj);
-            obj.Parent = this;
-        }
-
-        public void RemoveChild(T obj)
-        {
-            obj.Parent = null;
-            children.Remove(obj);
-        }
-
-        public void RemoveChild(int i)
-        {
-            children[i].Parent = null;
-            children.RemoveAt(i);
-        }
-
-        public int IndexOf(T obj)
-        {
-            return children.IndexOf(obj);
-        }
-
-        public IEnumerator<T> GetEnumerator()
-        {
-            return children.GetEnumerator();
-        }
-
-        IEnumerator IEnumerable.GetEnumerator()
-        {
-            return GetEnumerator();
-        }
-    }
-}