diff --git a/dlls/nodes.cpp b/dlls/nodes.cpp
index 04705638..5e5b6acf 100644
--- a/dlls/nodes.cpp
+++ b/dlls/nodes.cpp
@@ -21,6 +21,7 @@
 #include	"cbase.h"
 #include	"monsters.h"
 #include	"nodes.h"
+#include	"nodes_compat.h"
 #include	"animation.h"
 #include	"doors.h"
 
@@ -2386,42 +2387,47 @@ int CGraph::FLoadGraph( const char *szMapName )
 	pMemFile = aMemFile = LOAD_FILE_FOR_ME( szFilename, &length );
 
 	if( !aMemFile )
-	{
 		return FALSE;
-	}
-	else
-	{
-		// Read the graph version number
-		//
-		length -= sizeof(int);
-		if( length < 0 )
-			goto ShortFile;
-		memcpy( &iVersion, pMemFile, sizeof(int) );
-		pMemFile += sizeof(int);
 
-		if( iVersion != GRAPH_VERSION )
-		{
-			// This file was written by a different build of the dll!
-			//
-			ALERT( at_aiconsole, "**ERROR** Graph version is %d, expected %d\n", iVersion, GRAPH_VERSION );
-			goto ShortFile;
-		}
+	// Read the graph version number
+	//
+	length -= sizeof(int);
+	if( length < 0 )
+		goto ShortFile;
+	iVersion = *(int *) pMemFile;
+	pMemFile += sizeof(int);
 
+	if( iVersion == GRAPH_VERSION || iVersion == 16 )
+	{
 		// Read the graph class
 		//
-		length -= sizeof(CGraph);
-		if( length < 0 )
-			goto ShortFile;
-		memcpy( this, pMemFile, sizeof(CGraph) );
-		pMemFile += sizeof(CGraph);
+		if ( iVersion == GRAPH_VERSION )
+		{
+			length -= sizeof(CGraph);
+			if( length < 0 )
+				goto ShortFile;
+			memcpy( this, pMemFile, sizeof(CGraph) );
+			pMemFile += sizeof(CGraph);
 
-		// Set the pointers to zero, just in case we run out of memory.
-		//
-		m_pNodes = NULL;
-		m_pLinkPool = NULL;
-		m_di = NULL;
-		m_pRouteInfo = NULL;
-		m_pHashLinks = NULL;
+			// Set the pointers to zero, just in case we run out of memory.
+			//
+			m_pNodes = NULL;
+			m_pLinkPool = NULL;
+			m_di = NULL;
+			m_pRouteInfo = NULL;
+			m_pHashLinks = NULL;
+		}
+#if _GRAPH_VERSION != 16
+		else
+		{
+			ALERT( at_aiconsole, "Loading CGraph in GRAPH_VERSION 16 compatibility mode\n" );
+			length -= sizeof(CGraph_32);
+			if( length < 0 )
+				goto ShortFile;
+			reinterpret_cast<CGraph_32*>(pMemFile) -> copyOverTo(this);
+			pMemFile += sizeof(CGraph_32);
+		}
+#endif
 
 		// Malloc for the nodes
 		//
@@ -2453,11 +2459,25 @@ int CGraph::FLoadGraph( const char *szMapName )
 
 		// Read in all the links
 		//
-		length -= sizeof(CLink) * m_cLinks;
-		if( length < 0 )
-			goto ShortFile;
-		memcpy( m_pLinkPool, pMemFile, sizeof(CLink) * m_cLinks );
-		pMemFile += sizeof(CLink) * m_cLinks;
+		if( iVersion == GRAPH_VERSION )
+		{
+			length -= sizeof(CLink) * m_cLinks;
+			if( length < 0 )
+				goto ShortFile;
+			memcpy( m_pLinkPool, pMemFile, sizeof(CLink) * m_cLinks );
+			pMemFile += sizeof(CLink) * m_cLinks;
+		}
+#if _GRAPH_VERSION != 16
+		else
+		{
+			ALERT( at_aiconsole, "Loading CLink array in GRAPH_VERSION 16 compatibility mode\n" );
+			length -= sizeof(CLink_32) * m_cLinks;
+			if( length < 0 )
+				goto ShortFile;
+			reinterpret_cast<CLink_32*>(pMemFile) -> copyOverTo(m_pLinkPool);
+			pMemFile += sizeof(CLink_32) * m_cLinks;
+		}
+#endif
 
 		// Malloc for the sorting info.
 		//
@@ -2482,7 +2502,7 @@ int CGraph::FLoadGraph( const char *szMapName )
 		m_pRouteInfo = (signed char *)calloc( sizeof(signed char), m_nRouteInfo );
 		if( !m_pRouteInfo )
 		{
-			ALERT( at_aiconsole, "***ERROR**\nCounldn't malloc %d route bytes!\n", m_nRouteInfo );
+			ALERT( at_aiconsole, "***ERROR**\nCouldn't malloc %d route bytes!\n", m_nRouteInfo );
 			goto NoMemory;
 		}
 		m_CheckedCounter = 0;
@@ -2505,7 +2525,7 @@ int CGraph::FLoadGraph( const char *szMapName )
 		m_pHashLinks = (short *)calloc( sizeof(short), m_nHashLinks );
 		if( !m_pHashLinks )
 		{
-			ALERT( at_aiconsole, "***ERROR**\nCounldn't malloc %d hash link bytes!\n", m_nHashLinks );
+			ALERT( at_aiconsole, "***ERROR**\nCouldn't malloc %d hash link bytes!\n", m_nHashLinks );
 			goto NoMemory;
 		}
 
@@ -2531,6 +2551,13 @@ int CGraph::FLoadGraph( const char *szMapName )
 
 		return TRUE;
 	}
+	else
+	{
+		// This file was written by a different build of the dll!
+		//
+		ALERT( at_aiconsole, "**ERROR** Graph version is %d, expected %d\n", iVersion, GRAPH_VERSION );
+		goto ShortFile;
+	}
 
 ShortFile:
 NoMemory:
diff --git a/dlls/nodes.h b/dlls/nodes.h
index 52b715e5..f43684c8 100644
--- a/dlls/nodes.h
+++ b/dlls/nodes.h
@@ -106,10 +106,11 @@ typedef struct
 // CGraph 
 //=========================================================
 #ifdef XASH_64BIT
-#define	GRAPH_VERSION	(int)16 * 10
+#define	_GRAPH_VERSION	(16 * 10)
 #else
-#define	GRAPH_VERSION	(int)16// !!!increment this whever graph/node/link classes change, to obsolesce older disk files.
+#define	_GRAPH_VERSION	(16)// !!!increment this whever graph/node/link classes change, to obsolesce older disk files.
 #endif
+#define GRAPH_VERSION (int)_GRAPH_VERSION
 
 class CGraph
 {
diff --git a/dlls/nodes_compat.h b/dlls/nodes_compat.h
new file mode 100644
index 00000000..da91a5b8
--- /dev/null
+++ b/dlls/nodes_compat.h
@@ -0,0 +1,141 @@
+
+#pragma once
+#ifndef NODES_32BIT_COMPAT
+#define NODES_32BIT_COMPAT
+
+//#include "nodes.h"
+
+#if _GRAPH_VERSION != 16
+
+#include "stdint.h"
+
+typedef int32_t PTR32;
+
+class CGraph_32
+{
+public:
+
+	BOOL        m_fGraphPresent;
+	BOOL        m_fGraphPointersSet;
+	BOOL        m_fRoutingComplete;
+
+	PTR32       m_pNodes; // CNode*
+	PTR32       m_pLinkPool; // CLink*
+	PTR32       m_pRouteInfo; // signed char*
+
+	int         m_cNodes;
+	int         m_cLinks;
+	int         m_nRouteInfo;
+
+	PTR32       m_di; // DIST_INFO*
+	int         m_RangeStart[3][NUM_RANGES];
+	int         m_RangeEnd[3][NUM_RANGES];
+	float       m_flShortest;
+	int         m_iNearest;
+	int         m_minX, m_minY, m_minZ, m_maxX, m_maxY, m_maxZ;
+	int         m_minBoxX, m_minBoxY, m_minBoxZ, m_maxBoxX, m_maxBoxY, m_maxBoxZ;
+	int         m_CheckedCounter;
+	float       m_RegionMin[3], m_RegionMax[3];
+	CACHE_ENTRY m_Cache[CACHE_SIZE];
+
+
+	int         m_HashPrimes[16];
+	PTR32       m_pHashLinks; // short*
+	int         m_nHashLinks;
+
+	int         m_iLastActiveIdleSearch;
+
+	int         m_iLastCoverSearch;
+
+
+	void copyOverTo(CGraph *other) {
+		other->m_fGraphPresent	= m_fGraphPresent;
+		other->m_fGraphPointersSet	= m_fGraphPointersSet;
+		other->m_fRoutingComplete	= m_fRoutingComplete;
+
+		other->m_pNodes = NULL;
+		other->m_pLinkPool = NULL;
+		other->m_pRouteInfo = NULL;
+
+		other->m_cNodes	= m_cNodes;
+		other->m_cLinks	= m_cLinks;
+		other->m_nRouteInfo	= m_nRouteInfo;
+
+		other->m_di = NULL;
+#if _GRAPH_VERSION == 160
+		memcpy( (void *) &other->m_RangeStart, (void *) m_RangeStart,
+				offsetof(class CGraph, m_pHashLinks) - offsetof(class CGraph, m_RangeStart) );
+#else	// fallback routine if the graph version changes
+		for (int i = 0; i < 3; ++i)
+			for (int j = 0; j < NUM_RANGES; ++j)
+				other->m_RangeStart[i][j] = m_RangeStart[i][j];
+//		m_RangeStart[3][NUM_RANGES]
+		for (int i = 0; i < 3; ++i)
+			for (int j = 0; j < NUM_RANGES; ++j)
+				other->m_RangeEnd[i][j] = m_RangeEnd[i][j];
+//		m_RangeEnd[3][NUM_RANGES]
+		other->m_flShortest	= m_flShortest;
+		other->m_iNearest	= m_iNearest;
+		other->m_minX	= m_minX;
+		other->m_minY	= m_minY;
+		other->m_minZ	= m_minZ;
+		other->m_maxX	= m_maxX;
+		other->m_maxY	= m_maxY;
+		other->m_maxZ	= m_maxZ;
+		other->m_minBoxX	= m_minBoxX;
+		other->m_minBoxY	= m_minBoxY;
+		other->m_minBoxZ	= m_minBoxZ;
+		other->m_maxBoxX	= m_maxBoxX;
+		other->m_maxBoxY	= m_maxBoxY;
+		other->m_maxBoxZ	= m_maxBoxZ;
+		other->m_CheckedCounter	= m_CheckedCounter;
+		for (int i = 0; i < 3; ++i)
+			other->m_RegionMin[i]	= m_RegionMin[i];
+//		m_RegionMin[3]
+		for (int i = 0; i < 3; ++i)
+			other->m_RegionMax[i]	= m_RegionMax[i];
+//		m_RegionMax[3]
+		for (int i = 0; i < CACHE_SIZE; ++i)
+			other->m_Cache[i]	= m_Cache[i];
+//		m_Cache[CACHE_SIZE]
+		for (int i = 0; i < 16; ++i)
+			other->m_HashPrimes[i]	= m_HashPrimes[i];
+//		m_HashPrimes[16]
+#endif
+		other->m_pHashLinks = NULL;
+		other->m_nHashLinks	= m_nHashLinks;
+
+		other->m_iLastActiveIdleSearch	= m_iLastActiveIdleSearch;
+
+		other->m_iLastCoverSearch	= m_iLastCoverSearch;
+
+	}
+
+};
+
+
+class CLink_32
+{
+
+public:
+	int		m_iSrcNode;
+	int		m_iDestNode;
+	PTR32	m_pLinkEnt; // entvars_t*
+	char	m_szLinkEntModelname[ 4 ];
+	int		m_afLinkInfo;
+	float	m_flWeight;
+
+	void copyOverTo(CLink* other) {
+		other->m_iSrcNode	= m_iSrcNode;
+		other->m_iDestNode	= m_iDestNode	;
+		other->m_pLinkEnt	= NULL;
+		for (int i = 0; i < 4; ++i)
+			other->m_szLinkEntModelname[i]	= m_szLinkEntModelname[i];
+//		m_szLinkEntModelname[ 4 ]
+		other->m_afLinkInfo	= m_afLinkInfo;
+		other->m_flWeight	= m_flWeight;
+	}
+};
+
+#endif
+#endif