Index: src/ch/MainWnd.cpp
===================================================================
diff -u -N -rb5f6c00d1615afa6d26e4d74e564afe0af893174 -rd9426ed7d789d5a039b3d5bb92ef086c687ba285
--- src/ch/MainWnd.cpp	(.../MainWnd.cpp)	(revision b5f6c00d1615afa6d26e4d74e564afe0af893174)
+++ src/ch/MainWnd.cpp	(.../MainWnd.cpp)	(revision d9426ed7d789d5a039b3d5bb92ef086c687ba285)
@@ -2083,7 +2083,11 @@
 
 void CMainWnd::OnPopupRegisterdll() 
 {
+#ifdef _WIN64
+	HRESULT hResult = RegisterShellExtDll(_T("chext64.dll"), true);
+#else
 	HRESULT hResult = RegisterShellExtDll(_T("chext.dll"), true);
+#endif
 	if(SUCCEEDED(hResult))
 		MsgBox(IDS_REGISTEROK_STRING, MB_ICONINFORMATION | MB_OK);
 	else
@@ -2099,7 +2103,11 @@
 
 void CMainWnd::OnPopupUnregisterdll() 
 {
+#ifdef _WIN64
+	HRESULT hResult = RegisterShellExtDll(_T("chext64.dll"), false);
+#else
 	HRESULT hResult = RegisterShellExtDll(_T("chext.dll"), false);
+#endif
 	if(SUCCEEDED(hResult))
 		MsgBox(IDS_UNREGISTEROK_STRING, MB_ICONINFORMATION | MB_OK);
 	else