diff --git a/beat/editor/widgets/mainwindow.py b/beat/editor/widgets/mainwindow.py
new file mode 100644
index 0000000000000000000000000000000000000000..b7ed7c0cdeabfcdf202db2889b11e47896ff2a0b
--- /dev/null
+++ b/beat/editor/widgets/mainwindow.py
@@ -0,0 +1,73 @@
+# vim: set fileencoding=utf-8 :
+###############################################################################
+#                                                                             #
+# Copyright (c) 2019 Idiap Research Institute, http://www.idiap.ch/           #
+# Contact: beat.support@idiap.ch                                              #
+#                                                                             #
+# This file is part of the beat.editor module of the BEAT platform.           #
+#                                                                             #
+# Commercial License Usage                                                    #
+# Licensees holding valid commercial BEAT licenses may use this file in       #
+# accordance with the terms contained in a written agreement between you      #
+# and Idiap. For further information contact tto@idiap.ch                     #
+#                                                                             #
+# Alternatively, this file may be used under the terms of the GNU Affero      #
+# Public License version 3 as published by the Free Software and appearing    #
+# in the file LICENSE.AGPL included in the packaging of this file.            #
+# The BEAT platform is distributed in the hope that it will be useful, but    #
+# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY  #
+# or FITNESS FOR A PARTICULAR PURPOSE.                                        #
+#                                                                             #
+# You should have received a copy of the GNU Affero Public License along      #
+# with the BEAT platform. If not, see http://www.gnu.org/licenses/.           #
+#                                                                             #
+###############################################################################
+
+from PyQt5.QtWidgets import QHBoxLayout
+from PyQt5.QtWidgets import QMainWindow
+from PyQt5.QtWidgets import QWidget
+from PyQt5.QtWidgets import qApp
+
+from .assetbrowser import AssetBrowser
+from .assetwidget import AssetWidget
+
+
+class MainWindow(QMainWindow):
+    """
+    Main window of the beat.editor application
+    """
+
+    def __init__(self, parent=None):
+        """Constructor"""
+
+        super(MainWindow, self).__init__(parent)
+
+        menubar = self.menuBar()
+        fileMenu = menubar.addMenu(self.tr("File"))
+        quitAction = fileMenu.addAction(self.tr("Quit"))
+        quitAction.setShortcut("CTRL+Q")
+        quitAction.triggered.connect(qApp.quit)
+
+        preferencesMenu = menubar.addMenu(self.tr("Preferences"))
+        settingsAction = preferencesMenu.addAction(self.tr("Settings"))
+
+        self.assetBrowser = AssetBrowser()
+        self.assetWidget = AssetWidget()
+
+        centralWidget = QWidget()
+        layout = QHBoxLayout(centralWidget)
+        layout.addWidget(self.assetBrowser)
+        layout.addWidget(self.assetWidget)
+        self.setCentralWidget(centralWidget)
+
+        self.assetBrowser.json_selected.connect(self.assetWidget.show_json)
+        settingsAction.triggered.connect(self.show_settings)
+
+    def set_prefix_root(self, prefix_root_path):
+        """Sets the root path of the prefix to edit"""
+
+        self.assetBrowser.set_prefix_root(prefix_root_path)
+
+    def show_settings(self):
+        """Show settings dialog"""
+        pass