Index: qelectrotech.pro
===================================================================
--- qelectrotech.pro	(revision 5241)
+++ qelectrotech.pro	(working copy)
@@ -31,7 +31,7 @@
 	QET_LANG_PATH              = 'lang/'
 	QET_LICENSE_PATH           = './'
 	# Liste des ressources Windows
-    RC_FILE = qelectrotech.rc
+    #RC_FILE = qelectrotech.rc
 }
 macx {
 	# Chemins MacOS X
Index: sources/diagramprintdialog.cpp
===================================================================
--- sources/diagramprintdialog.cpp	(revision 5241)
+++ sources/diagramprintdialog.cpp	(working copy)
@@ -354,7 +354,25 @@
 */
 void DiagramPrintDialog::print(const QList<Diagram *> &diagrams, bool fit_page, const ExportProperties options) {
 	//qDebug() << "Demande d'impression de " << diagrams.count() << "schemas.";
-	
+#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
+    #ifdef Q_OS_WIN
+        #ifdef QT_DEBUG
+            qDebug() << "--";
+            qDebug() << "DiagramPrintDialog::print  printer_->resolution() before " << printer_->resolution();
+            qDebug() << "DiagramPrintDialog::print  screennumber " << QApplication::desktop()->screenNumber();
+        #endif
+
+        QScreen *srn = QApplication::screens().at(QApplication::desktop()->screenNumber());
+        qreal dotsPerInch = (qreal)srn->logicalDotsPerInch();
+        printer_->setResolution(dotsPerInch);
+
+        #ifdef QT_DEBUG
+            qDebug() << "DiagramPrintDialog::print  dotsPerInch " << dotsPerInch;
+            qDebug() << "DiagramPrintDialog::print  printer_->resolution() after" << printer_->resolution();
+            qDebug() << "--";
+        #endif
+    #endif
+#endif
 	// QPainter utiliser pour effectuer le rendu
 	QPainter qp(printer_);
 	
Index: sources/main.cpp
===================================================================
--- sources/main.cpp	(revision 5241)
+++ sources/main.cpp	(working copy)
@@ -32,14 +32,10 @@
 	QCoreApplication::setApplicationName("QElectroTech");
 		//Creation and execution of the application
 		//HighDPI
-#if QT_VERSION >= QT_VERSION_CHECK (5, 6, 0)
-#if defined Q_OS_MAC
-    QApplication::setAttribute (Qt::AA_EnableHighDpiScaling);
-#elif !defined(Q_OS_MAC)
-    QApplication::setAttribute (Qt::AA_DisableHighDpiScaling);
+#if QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)
+    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
 #else
-    qputenv("QT_DEVICE_PIXEL_RATIO", QByteArray("1"));
+    qputenv("QT_DEVICE_PIXEL_RATIO", QByteArray("auto"));
 #endif
-#endif
 	return(QETApp(argc, argv).exec());
 }