diff --git a/CGraphicsModel.bt b/CGraphicsModel.bt
index 321a24a..bd5eb40 100644
--- a/CGraphicsModel.bt
+++ b/CGraphicsModel.bt
@@ -3,6 +3,7 @@
 #include "CAABox.bt"
 #include "CEvalSystem.bt"
 #include "CVector4i.bt"
+#include "CRenderOctree.bt"
 
 struct SModelAnimatedUVData {
   CEvalSystem evalSystem;
@@ -92,6 +93,10 @@ struct SSkinnedModelHeader {
   uint data[dataCount];
 };
 
+struct SWorldModelHeader {
+  uchar unk;
+};
+
 typedef struct{
    char type[4];
    char format[4];
@@ -343,7 +348,6 @@ typedef struct {
 struct SMeshLoadInformation {
     uint meshCount;
     CRenderMesh meshes[meshCount];
-    uint unk;
 };
 
 typedef struct {
@@ -351,6 +355,17 @@ typedef struct {
 
   local uint pos<format = hex, hidden = true> = FTell();
   switch (chunk.id) {
+  case "WDHD":
+    SWorldModelHeader worldHeader;
+    CRenderOctree renderOctree;
+    uint aaboxCount;
+    CAABox aaboxes[aaboxCount];
+    uint floatCount;
+    float floats[floatCount];
+    ushort unk;
+    uint shortCount;
+    ushort shorts[shortCount];
+    break;
   case "HEAD":
     ModelHeader header;
     break;
diff --git a/CRenderOctree.bt b/CRenderOctree.bt
new file mode 100644
index 0000000..7b69181
--- /dev/null
+++ b/CRenderOctree.bt
@@ -0,0 +1,27 @@
+#ifndef _CRENDEROCTREE
+#define _CRENDEROCTREE
+
+#include "Common.bt"
+#include "CAABox.bt"
+
+struct CRenderOctree {
+    struct SHeader {
+        FourCC fcc;
+        uint version;
+        uint bitmaskCount;
+        uint bitmaskNumBits;
+        uint entryNodeCount;
+        CAABox bounds;
+    };
+    SHeader header;
+    uint bitmaskWordCount;
+    uint bitmaskWords[bitmaskWordCount];
+    uint edgeOffsetCount;
+    uint edgeOffsets[edgeOffsetCount];
+    uint dataSize;
+    char data[dataSize];
+    uint aaboxCount;
+    CAABox aaboxes[aaboxCount];
+};
+
+#endif// _CRENDEROCTREE
diff --git a/Run.bt b/Run.bt
index b4caa25..cb93f04 100644
--- a/Run.bt
+++ b/Run.bt
@@ -44,6 +44,7 @@ typedef struct
             break;
         case "CMDL":
         case "SMDL":
+        case "WMDL":
             ModelFile model(form.size);
             break;
         case "MSBT":