Fix compatibility with old compilers.

src/app/tape/mapplication.cpp

@@ -1049,10 +1049,10 @@ auto MApplication::StartWithKnownMeasurementFiles(QCommandLineParser &parser) ->
     return std::all_of(args.begin(), args.end(),
                        [this](const auto &arg)
                        {
-                           NewMainKMWindow();
+                           this->NewMainKMWindow();
-                           if (not MainKMWindow()->LoadFile(arg))
+                           if (not this->MainKMWindow()->LoadFile(arg))
                            {
-                               delete MainKMWindow();
+                               delete this->MainKMWindow();
                                return !m_testMode;
                            }
 

src/app/tape/tkmmainwindow.cpp

@@ -539,7 +539,7 @@ void TKMMainWindow::FileNew()
 //---------------------------------------------------------------------------------------------------------------------
 void TKMMainWindow::OpenKnownMeasurements()
 {
-    const QString filter = tr("Known measurements") + " (*.vit);;"_L1 + tr("All files") + " (*.*)"_L1;
+    const QString filter = tr("Known measurements") + " (*.vkm);;"_L1 + tr("All files") + " (*.*)"_L1;
     // Use standard path to known measurements
     QString pathTo = MApplication::VApp()->TapeSettings()->GetPathKnownMeasurements();