--- a/src/corelib/plugin/qlibrary_win.cpp
+++ b/src/corelib/plugin/qlibrary_win.cpp
@@ -86,7 +86,12 @@ bool QLibraryPrivate::load_sys()
     QStringList attempts;
 
     if (pluginState != IsAPlugin)
-        attempts.append(fileName + QLatin1String(".dll"));
+	{
+		if( fileName.endsWith( QLatin1String(".dll"), Qt::CaseInsensitive ) )
+			attempts.append(fileName);
+		else
+			attempts.append(fileName + QLatin1String(".dll"));
+	}
 
     // If the fileName is an absolute path we try that first, otherwise we
     // use the system-specific suffix first