diff --git a/PckStudio.Core/Extensions/PckAssetExtensions.cs b/PckStudio.Core/Extensions/PckAssetExtensions.cs
index bbd0108b..5318a8f3 100644
--- a/PckStudio.Core/Extensions/PckAssetExtensions.cs
+++ b/PckStudio.Core/Extensions/PckAssetExtensions.cs
@@ -21,22 +21,6 @@ namespace PckStudio.Core.Extensions
     {
         private const string MipMap = "MipMapLevel";
 
-        public static PckAsset CreateNewAssetIf(this PckFile pck, bool condition, string filename, PckAssetType filetype, IDataFormatWriter writer)
-        {
-            if (condition)
-            {
-                return pck.CreateNewAsset(filename, filetype, writer);
-            }
-            return default;
-        }
-
-        public static PckAsset CreateNewAsset(this PckFile pck, string filename, PckAssetType filetype, IDataFormatWriter writer)
-        {
-            PckAsset asset = pck.CreateNewAsset(filename, filetype);
-            asset.SetData(writer);
-            return asset;
-        }
-
         public static Image GetTexture(this PckAsset asset)
         {
             if (asset.Type != PckAssetType.SkinFile &&
diff --git a/PckStudio.Core/Extensions/PckFileExtensions.cs b/PckStudio.Core/Extensions/PckFileExtensions.cs
new file mode 100644
index 00000000..750c935a
--- /dev/null
+++ b/PckStudio.Core/Extensions/PckFileExtensions.cs
@@ -0,0 +1,95 @@
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using OMI.Formats.Languages;
+using OMI.Formats.Pck;
+using OMI.Workers;
+using PckStudio.Core.Skin;
+
+namespace PckStudio.Core.Extensions
+{
+    public static class PckFileExtensions
+    {
+        public static PckAsset AddTexture(this PckFile pck, string assetPath, Image texture)
+        {
+            PckAsset asset = new PckAsset(assetPath, PckAssetType.TextureFile);
+            asset.SetTexture(texture);
+            pck.AddAsset(asset);
+            return asset;
+        }
+
+        public static PckAsset AddSkin(this PckFile pck, string assetPathPrefix, Skin.Skin skin, LOCFile localisation)
+        {
+            string skinId = skin.Identifier.ToString("d08");
+
+            PckAsset asset = new PckAsset(Path.Combine(assetPathPrefix, $"dlcskin{skinId}.png"), PckAssetType.SkinFile);
+
+            asset.SetTexture(skin.Texture);
+
+            asset.AddProperty("DISPLAYNAME", skin.MetaData.Name);
+
+            bool canLocalize = localisation is not null;
+            if (canLocalize)
+            {
+                string skinLocKey = $"IDS_dlcskin{skinId}_DISPLAYNAME";
+                asset.AddProperty("DISPLAYNAMEID", skinLocKey);
+                localisation.SetLocEntry(skinLocKey, skin.MetaData.Name);
+            }
+
+            if (!string.IsNullOrEmpty(skin.MetaData.Theme))
+            {
+                asset.AddProperty("THEMENAME", skin.MetaData.Theme);
+
+                if (canLocalize)
+                {
+                    string skinThemeLocKey = $"IDS_dlcskin{skinId}_THEMENAME";
+                    asset.AddProperty("THEMENAMEID", skinThemeLocKey);
+                    localisation.SetLocEntry(skinThemeLocKey, skin.MetaData.Theme);
+                }
+            }
+
+            if (skin.HasCape)
+            {
+                asset.AddProperty("CAPEPATH", $"dlccape{skinId}.png");
+            }
+
+            asset.AddProperty("ANIM", skin.Anim);
+            asset.AddProperty("GAME_FLAGS", "0x18");
+            asset.AddProperty("FREE", "1");
+
+            foreach (SkinBOX box in skin.Model.AdditionalBoxes)
+            {
+                asset.AddProperty(box.ToProperty());
+            }
+            foreach (SkinPartOffset offset in skin.Model.PartOffsets)
+            {
+                asset.AddProperty(offset.ToProperty());
+            }
+
+            pck.AddAsset(asset);
+            return asset;
+        }
+
+        public static PckAsset CreateNewAssetIf(this PckFile pck, bool condition, string filename, PckAssetType filetype, IDataFormatWriter writer)
+        {
+            if (condition)
+            {
+                return pck.CreateNewAsset(filename, filetype, writer);
+            }
+            return default;
+        }
+
+        public static PckAsset CreateNewAsset(this PckFile pck, string filename, PckAssetType filetype, IDataFormatWriter writer)
+        {
+            PckAsset asset = pck.CreateNewAsset(filename, filetype);
+            asset.SetData(writer);
+            return asset;
+        }
+
+    }
+}
diff --git a/PckStudio.Core/PckStudio.Core.csproj b/PckStudio.Core/PckStudio.Core.csproj
index 3566cf89..1fb9c5ae 100644
--- a/PckStudio.Core/PckStudio.Core.csproj
+++ b/PckStudio.Core/PckStudio.Core.csproj
@@ -98,6 +98,7 @@
     <Compile Include="Extensions\ModelBoxExtension.cs" />
     <Compile Include="Extensions\OpenTKExtensions.cs" />
     <Compile Include="Extensions\PckAssetExtensions.cs" />
+    <Compile Include="Extensions\PckFileExtensions.cs" />
     <Compile Include="Extensions\PictureBoxExtensions.cs" />
     <Compile Include="Extensions\SkinBOXExtensions.cs" />
     <Compile Include="Extensions\SkinExtensions.cs" />