diff --git a/GUI/mainwindow/OutputDataIOHistory.cpp b/GUI/Project/OutputDataIOHistory.cpp
similarity index 97%
rename from GUI/mainwindow/OutputDataIOHistory.cpp
rename to GUI/Project/OutputDataIOHistory.cpp
index 85c1f996ed17df8b175845abe524e3d06fe25530..8dfe83cc3dac5aed4ebab8645e3891072bf59e3f 100644
--- a/GUI/mainwindow/OutputDataIOHistory.cpp
+++ b/GUI/Project/OutputDataIOHistory.cpp
@@ -2,7 +2,7 @@
 //
 //  BornAgain: simulate and fit reflection and scattering
 //
-//! @file      GUI/mainwindow/OutputDataIOHistory.cpp
+//! @file      GUI/Project/OutputDataIOHistory.cpp
 //! @brief     Defines OutputDataIOHistory classes
 //!
 //! @homepage  http://www.bornagainproject.org
@@ -12,7 +12,7 @@
 //
 //  ************************************************************************************************
 
-#include "GUI/mainwindow/OutputDataIOHistory.h"
+#include "GUI/Project/OutputDataIOHistory.h"
 #include "Base/Utils/Assert.h"
 #include "GUI/utils/Error.h"
 #include "GUI/utils/SaveLoadInterface.h"
diff --git a/GUI/mainwindow/OutputDataIOHistory.h b/GUI/Project/OutputDataIOHistory.h
similarity index 90%
rename from GUI/mainwindow/OutputDataIOHistory.h
rename to GUI/Project/OutputDataIOHistory.h
index 189eeae3d68c062844619eed5a6e82e47f6055c1..ccf9f969393b9d845d34a7c8d09596f040c3111e 100644
--- a/GUI/mainwindow/OutputDataIOHistory.h
+++ b/GUI/Project/OutputDataIOHistory.h
@@ -2,7 +2,7 @@
 //
 //  BornAgain: simulate and fit reflection and scattering
 //
-//! @file      GUI/mainwindow/OutputDataIOHistory.h
+//! @file      GUI/Project/OutputDataIOHistory.h
 //! @brief     Defines OutputDataIOHistory classes
 //!
 //! @homepage  http://www.bornagainproject.org
@@ -12,8 +12,8 @@
 //
 //  ************************************************************************************************
 
-#ifndef BORNAGAIN_GUI_MAINWINDOW_OUTPUTDATAIOHISTORY_H
-#define BORNAGAIN_GUI_MAINWINDOW_OUTPUTDATAIOHISTORY_H
+#ifndef BORNAGAIN_GUI_PROJECT_OUTPUTDATAIOHISTORY_H
+#define BORNAGAIN_GUI_PROJECT_OUTPUTDATAIOHISTORY_H
 
 #include <QDateTime>
 #include <QMap>
@@ -80,4 +80,4 @@ private:
     QMap<QString, OutputDataDirHistory> m_dir_history;
 };
 
-#endif // BORNAGAIN_GUI_MAINWINDOW_OUTPUTDATAIOHISTORY_H
+#endif // BORNAGAIN_GUI_PROJECT_OUTPUTDATAIOHISTORY_H
diff --git a/GUI/Project/OutputDataIOService.h b/GUI/Project/OutputDataIOService.h
index 9b943b21c03b3fbe6b2be7c392abb09f662db9c4..0234ee1d4df3b842d1fdbbdbf45cb37668552980 100644
--- a/GUI/Project/OutputDataIOService.h
+++ b/GUI/Project/OutputDataIOService.h
@@ -15,7 +15,7 @@
 #ifndef BORNAGAIN_GUI_PROJECT_OUTPUTDATAIOSERVICE_H
 #define BORNAGAIN_GUI_PROJECT_OUTPUTDATAIOSERVICE_H
 
-#include "GUI/mainwindow/OutputDataIOHistory.h"
+#include "GUI/Project/OutputDataIOHistory.h"
 #include <QObject>
 
 class ApplicationModels;