M src/platform/qt/GameController.cpp → src/platform/qt/GameController.cpp

@@ -204,6 +204,7 @@ }
 
 	if (!GBAThreadStart(&m_threadContext)) {
 		m_gameOpen = false;
+		emit gameFailed();
 	}
 }
 

M src/platform/qt/GameController.h → src/platform/qt/GameController.h

@@ -66,6 +66,7 @@ void gameStopped(GBAThread*);
 	void gamePaused(GBAThread*);
 	void gameUnpaused(GBAThread*);
 	void gameCrashed(const QString& errorMessage);
+	void gameFailed();
 	void stateLoaded(GBAThread*);
 
 	void postLog(int level, const QString& log);

M src/platform/qt/Window.cpp → src/platform/qt/Window.cpp

@@ -83,6 +83,7 @@ connect(m_controller, SIGNAL(gameUnpaused(GBAThread*)), m_display, SLOT(unpauseDrawing()));
 	connect(m_controller, SIGNAL(postLog(int, const QString&)), m_logView, SLOT(postLog(int, const QString&)));
 	connect(m_controller, SIGNAL(frameAvailable(const uint32_t*)), this, SLOT(recordFrame()));
 	connect(m_controller, SIGNAL(gameCrashed(const QString&)), this, SLOT(gameCrashed(const QString&)));
+	connect(m_controller, SIGNAL(gameFailed()), this, SLOT(gameFailed()));
 	connect(m_logView, SIGNAL(levelsSet(int)), m_controller, SLOT(setLogLevel(int)));
 	connect(m_logView, SIGNAL(levelsEnabled(int)), m_controller, SLOT(enableLogLevel(int)));
 	connect(m_logView, SIGNAL(levelsDisabled(int)), m_controller, SLOT(disableLogLevel(int)));
@@ -382,6 +383,14 @@ tr("The game has crashed with the following error:\n\n%1").arg(errorMessage),
 		QMessageBox::Ok, this,  Qt::Sheet);
 	crash->setAttribute(Qt::WA_DeleteOnClose);
 	crash->show();
+}
+
+void Window::gameFailed() {
+	QMessageBox* fail = new QMessageBox(QMessageBox::Warning, tr("Couldn't Load"),
+		tr("Could not load game. Are you sure it's in the correct format?"),
+		QMessageBox::Ok, this,  Qt::Sheet);
+	fail->setAttribute(Qt::WA_DeleteOnClose);
+	fail->show();
 }
 
 void Window::redoLogo() {

M src/platform/qt/Window.h → src/platform/qt/Window.h

@@ -96,6 +96,7 @@ private slots:
 	void gameStarted(GBAThread*);
 	void gameStopped();
 	void gameCrashed(const QString&);
+	void gameFailed();
 	void redoLogo();
 
 	void recordFrame();