diff --git a/wrap/io_trimesh/export_u3d.h b/wrap/io_trimesh/export_u3d.h
index 108a33cb..2b295e04 100644
--- a/wrap/io_trimesh/export_u3d.h
+++ b/wrap/io_trimesh/export_u3d.h
@@ -1,7 +1,12 @@
 #ifndef __VCGLIB_EXPORTERU3D
 #define __VCGLIB_EXPORTERU3D
 
+#include <cstdlib>
 #include <string>
+#include <QDir.h>
+#include<QString.h>
+
+#include "export_idtf.h"
 
 namespace vcg {
 namespace tri {
@@ -13,53 +18,43 @@ class ExporterU3D
 private:
 
 #ifdef WIN32
-	static void CreateDir()
+	static void InvokeConverter(const QString& input_idtf,const QString& output_u3d)
 	{
-		system("mkdir __tmp_dir");
-	}
-
-	static void RemoveDir()
-	{
-		system("rmdir /S /Q __tmp_dir");
-	}
-
-	static void InvokeConverter(const char* converter_path,const char* idtf_file,const char* u3d_file)
-	{
-		std::string com(converter_path);
-		system(("cd " + com).c_str());
-		com = std::string("IDTFConverter.exe -input ") + idtf_file + " -output " + u3d_file;
-		system(com.c_str());
+		system(("IDTFConverter.exe -input " + input_idtf + " -output " + output_u3d ).toAscii());
 	}
 
 #else
 	#ifdef LINUX
-	static void CreateDir()
-	{
-		system("echo off mkdir __tmp_dir");
-	}
 
-	static void RemoveDir()
-	{
-		system("echo off rmdir -ignore-fail-on-non-empty __tmp_dir");
-	}
+		static void InvokeConverter(const QString& input_idtf,const QString& output_u3d)
+		{
+			system(("IDTFConverter.exe -input " + input_idtf + " -output " + output_u3d ).toAscii()));
+		}
 
-	static void InvokeConverter(const char* converter_path,const char* idtf_file,const char* u3d_file)
-	{
-
-	}
 	#endif
 #endif
 
+
 public:
 	
 	static void Save(SaveMeshType& m,const char* outputfile,const int mask)
 	{
-		CreateDir();
-		std::string tmp(outputfile);
-		tmp = "tmp_dir/" + tmp + ".idtf";
-		vcg::tri::io::ExporterIDTF<SaveMeshType>::Save(m,tmp.c_str(),mask);
-		InvokeConverter("../../code/lib/U3D/Bin/Win32/Release",tmp.c_str() ,outputfile);
-		RemoveDir();
+		QDir dir;
+		
+		if (!dir.mkdir("__tmp_dir")) return;
+		else
+		{
+			QString curr = QDir::currentPath();
+			QString tmp(outputfile);
+			tmp = "__tmp_dir/" + tmp + ".idtf";
+			vcg::tri::io::ExporterIDTF<SaveMeshType>::Save(m,tmp.toAscii(),mask);
+			QDir::setCurrent("../../code/lib/U3D/Bin/Win32/Release");
+			InvokeConverter((curr + "/" + tmp).toAscii(),(curr + "/" + outputfile).toAscii());
+			QDir::setCurrent(curr);
+			dir.remove(tmp.toAscii());
+			dir.rmdir("__tmp_dir");
+		}
+
 	}
 };