diff --git a/packages/sirius-web/frontend/sirius-web-application/src/application/SiriusWebApplication.tsx b/packages/sirius-web/frontend/sirius-web-application/src/application/SiriusWebApplication.tsx
index 5a30ed69ee..24ced3d54f 100644
--- a/packages/sirius-web/frontend/sirius-web-application/src/application/SiriusWebApplication.tsx
+++ b/packages/sirius-web/frontend/sirius-web-application/src/application/SiriusWebApplication.tsx
@@ -13,40 +13,13 @@
 import {
   ConfirmationDialogContextProvider,
   ExtensionProvider,
-  ExtensionRegistry,
-  RepresentationMetadata,
   RepresentationPathContext,
   ServerContext,
-  WorkbenchViewContribution,
-  representationFactoryExtensionPoint,
-  workbenchMainAreaExtensionPoint,
-  workbenchViewContributionExtensionPoint,
 } from '@eclipse-sirius/sirius-components-core';
-import { DeckRepresentation } from '@eclipse-sirius/sirius-components-deck';
-import {
-  DiagramRepresentation,
-  NodeTypeContext,
-  NodeTypeContextValue,
-} from '@eclipse-sirius/sirius-components-diagrams';
-import { FormDescriptionEditorRepresentation } from '@eclipse-sirius/sirius-components-formdescriptioneditors';
-import {
-  DetailsView,
-  FormRepresentation,
-  PropertySectionContext,
-  RelatedElementsView,
-  RepresentationsView,
-} from '@eclipse-sirius/sirius-components-forms';
-import { GanttRepresentation } from '@eclipse-sirius/sirius-components-gantt';
-import { PortalRepresentation } from '@eclipse-sirius/sirius-components-portals';
-import { ExplorerView } from '@eclipse-sirius/sirius-components-trees';
-import { ValidationView } from '@eclipse-sirius/sirius-components-validation';
+import { NodeTypeContext, NodeTypeContextValue } from '@eclipse-sirius/sirius-components-diagrams';
+import { PropertySectionContext } from '@eclipse-sirius/sirius-components-forms';
 import CssBaseline from '@material-ui/core/CssBaseline';
 import { Theme, ThemeProvider } from '@material-ui/core/styles';
-import AccountTreeIcon from '@material-ui/icons/AccountTree';
-import Filter from '@material-ui/icons/Filter';
-import LinkIcon from '@material-ui/icons/Link';
-import MenuIcon from '@material-ui/icons/Menu';
-import WarningIcon from '@material-ui/icons/Warning';
 import React from 'react';
 import { BrowserRouter } from 'react-router-dom';
 import { ToastProvider } from '../../src/toast/ToastProvider';
@@ -55,10 +28,10 @@ import {
   defaultNodeTypeRegistry,
 } from '../diagrams/DiagramRepresentationConfiguration';
 import { DiagramRepresentationConfigurationProps } from '../diagrams/DiagramRepresentationConfiguration.types';
+import { defaultExtensionRegistry } from '../extension/DefaultExtensionRegistry';
 import { DefaultExtensionRegistryMergeStrategy } from '../extension/DefaultExtensionRegistryMergeStrategy';
 import { propertySectionsRegistry } from '../forms/defaultPropertySectionRegistry';
 import { ApolloGraphQLProvider } from '../graphql/ApolloGraphQLProvider';
-import { OnboardArea } from '../onboarding/OnboardArea';
 import { Router } from '../router/Router';
 import { siriusWebTheme as defaultTheme } from '../theme/siriusWebTheme';
 import { SiriusWebApplicationProps } from './SiriusWebApplication.types';
@@ -70,13 +43,6 @@ const style = {
   minHeight: '100vh',
 };
 
-const getType = (representation: RepresentationMetadata): string => {
-  const query = representation.kind.substring(representation.kind.indexOf('?') + 1, representation.kind.length);
-  const params = new URLSearchParams(query);
-  const type = params.get('type');
-  return type;
-};
-
 export const SiriusWebApplication = ({
   httpOrigin,
   wsOrigin,
@@ -102,86 +68,15 @@ export const SiriusWebApplication = ({
     return `/projects/${editingContextId}/edit/${representationId}`;
   };
 
-  const workbenchViewContributions: WorkbenchViewContribution[] = [
-    {
-      side: 'left',
-      title: 'Explorer',
-      icon: <AccountTreeIcon />,
-      component: ExplorerView,
-    },
-    {
-      side: 'left',
-      title: 'Validation',
-      icon: <WarningIcon />,
-      component: ValidationView,
-    },
-    {
-      side: 'right',
-      title: 'Details',
-      icon: <MenuIcon />,
-      component: DetailsView,
-    },
-    {
-      side: 'right',
-      title: 'Representations',
-      icon: <Filter />,
-      component: RepresentationsView,
-    },
-    {
-      side: 'right',
-      title: 'Related Elements',
-      icon: <LinkIcon />,
-      component: RelatedElementsView,
-    },
-  ];
-
-  const internalExtensionRegistry = new ExtensionRegistry();
-  internalExtensionRegistry.addComponent(workbenchMainAreaExtensionPoint, {
-    identifier: 'siriusweb_workbench#mainArea',
-    Component: OnboardArea,
-  });
-  internalExtensionRegistry.putData(workbenchViewContributionExtensionPoint, {
-    identifier: 'siriusweb_workbench#viewContribution',
-    data: workbenchViewContributions,
-  });
-
-  internalExtensionRegistry.putData(representationFactoryExtensionPoint, {
-    identifier: 'siriusweb_workbench#representationFactory_diagram',
-    data: [(representation) => (getType(representation) === 'Diagram' ? DiagramRepresentation : null)],
-  });
-  internalExtensionRegistry.putData(representationFactoryExtensionPoint, {
-    identifier: 'siriusweb_workbench#representationFactory_form',
-    data: [(representation) => (getType(representation) === 'Form' ? FormRepresentation : null)],
-  });
-  internalExtensionRegistry.putData(representationFactoryExtensionPoint, {
-    identifier: 'siriusweb_workbench#representationFactory_formdescriptioneditor',
-    data: [
-      (representation) =>
-        getType(representation) === 'FormDescriptionEditor' ? FormDescriptionEditorRepresentation : null,
-    ],
-  });
-  internalExtensionRegistry.putData(representationFactoryExtensionPoint, {
-    identifier: 'siriusweb_workbench#representationFactory_gantt',
-    data: [(representation) => (getType(representation) === 'Gantt' ? GanttRepresentation : null)],
-  });
-  internalExtensionRegistry.putData(representationFactoryExtensionPoint, {
-    identifier: 'siriusweb_workbench#representationFactory_deck',
-    data: [(representation) => (getType(representation) === 'Deck' ? DeckRepresentation : null)],
-  });
-  internalExtensionRegistry.putData(representationFactoryExtensionPoint, {
-    identifier: 'siriusweb_workbench#representationFactory_portal',
-    data: [(representation) => (getType(representation) === 'Portal' ? PortalRepresentation : null)],
-  });
-
   if (extensionRegistry) {
-    internalExtensionRegistry.addAll(
+    defaultExtensionRegistry.addAll(
       extensionRegistry,
       extensionRegistryMergeStrategy ? extensionRegistryMergeStrategy : new DefaultExtensionRegistryMergeStrategy()
     );
   }
 
   return (
-    <ExtensionProvider registry={internalExtensionRegistry}>
+    <ExtensionProvider registry={defaultExtensionRegistry}>
       <ApolloGraphQLProvider httpOrigin={httpOrigin} wsOrigin={wsOrigin}>
         <BrowserRouter>
           <ThemeProvider theme={siriusWebTheme}>
diff --git a/packages/sirius-web/frontend/sirius-web-application/src/extension/DefaultExtensionRegistry.tsx b/packages/sirius-web/frontend/sirius-web-application/src/extension/DefaultExtensionRegistry.tsx
new file mode 100644
index 0000000000..f1fb29b903
--- /dev/null
+++ b/packages/sirius-web/frontend/sirius-web-application/src/extension/DefaultExtensionRegistry.tsx
@@ -0,0 +1,142 @@
+/*******************************************************************************
+ * Copyright (c) 2024 Obeo.
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *     Obeo - initial API and implementation
+ *******************************************************************************/
+import {
+  ExtensionRegistry,
+  RepresentationMetadata,
+  WorkbenchViewContribution,
+  representationFactoryExtensionPoint,
+  workbenchMainAreaExtensionPoint,
+  workbenchViewContributionExtensionPoint,
+} from '@eclipse-sirius/sirius-components-core';
+import { DeckRepresentation } from '@eclipse-sirius/sirius-components-deck';
+import { DiagramRepresentation } from '@eclipse-sirius/sirius-components-diagrams';
+import { FormDescriptionEditorRepresentation } from '@eclipse-sirius/sirius-components-formdescriptioneditors';
+import {
+  DetailsView,
+  FormRepresentation,
+  RelatedElementsView,
+  RepresentationsView,
+} from '@eclipse-sirius/sirius-components-forms';
+import { GanttRepresentation } from '@eclipse-sirius/sirius-components-gantt';
+import { PortalRepresentation } from '@eclipse-sirius/sirius-components-portals';
+import { ExplorerView } from '@eclipse-sirius/sirius-components-trees';
+import { ValidationView } from '@eclipse-sirius/sirius-components-validation';
+import AccountTreeIcon from '@material-ui/icons/AccountTree';
+import Filter from '@material-ui/icons/Filter';
+import LinkIcon from '@material-ui/icons/Link';
+import MenuIcon from '@material-ui/icons/Menu';
+import WarningIcon from '@material-ui/icons/Warning';
+import { OnboardArea } from '../onboarding/OnboardArea';
+
+const getType = (representation: RepresentationMetadata): string | null => {
+  const query = representation.kind.substring(representation.kind.indexOf('?') + 1, representation.kind.length);
+  const params = new URLSearchParams(query);
+  const type = params.get('type');
+  return type;
+};
+
+const defaultExtensionRegistry = new ExtensionRegistry();
+
+/*******************************************************************************
+ *
+ * Workbench main area
+ *
+ * Used to register the component used by default when no representation is opened
+ *
+ *******************************************************************************/
+defaultExtensionRegistry.addComponent(workbenchMainAreaExtensionPoint, {
+  identifier: `siriusweb_${workbenchMainAreaExtensionPoint.identifier}`,
+  Component: OnboardArea,
+});
+
+/*******************************************************************************
+ *
+ * Workbench views
+ *
+ * Used to register all the views available in the left and right of the workbench
+ *
+ *******************************************************************************/
+const workbenchViewContributions: WorkbenchViewContribution[] = [
+  {
+    side: 'left',
+    title: 'Explorer',
+    icon: <AccountTreeIcon />,
+    component: ExplorerView,
+  },
+  {
+    side: 'left',
+    title: 'Validation',
+    icon: <WarningIcon />,
+    component: ValidationView,
+  },
+  {
+    side: 'right',
+    title: 'Details',
+    icon: <MenuIcon />,
+    component: DetailsView,
+  },
+  {
+    side: 'right',
+    title: 'Representations',
+    icon: <Filter />,
+    component: RepresentationsView,
+  },
+  {
+    side: 'right',
+    title: 'Related Elements',
+    icon: <LinkIcon />,
+    component: RelatedElementsView,
+  },
+];
+defaultExtensionRegistry.putData(workbenchViewContributionExtensionPoint, {
+  identifier: `siriusweb_${workbenchViewContributionExtensionPoint.identifier}`,
+  data: workbenchViewContributions,
+});
+
+/*******************************************************************************
+ *
+ * Workbench representation factories
+ *
+ * Used to register all the type of representations that are supported in Sirius Web
+ *
+ *******************************************************************************/
+
+defaultExtensionRegistry.putData(representationFactoryExtensionPoint, {
+  identifier: `siriusweb_${representationFactoryExtensionPoint.identifier}_diagram`,
+  data: [(representation) => (getType(representation) === 'Diagram' ? DiagramRepresentation : null)],
+});
+defaultExtensionRegistry.putData(representationFactoryExtensionPoint, {
+  identifier: `siriusweb_${representationFactoryExtensionPoint.identifier}_form`,
+  data: [(representation) => (getType(representation) === 'Form' ? FormRepresentation : null)],
+});
+defaultExtensionRegistry.putData(representationFactoryExtensionPoint, {
+  identifier: `siriusweb_${representationFactoryExtensionPoint.identifier}_formdescriptioneditor`,
+  data: [
+    (representation) =>
+      getType(representation) === 'FormDescriptionEditor' ? FormDescriptionEditorRepresentation : null,
+  ],
+});
+defaultExtensionRegistry.putData(representationFactoryExtensionPoint, {
+  identifier: `siriusweb_${representationFactoryExtensionPoint.identifier}_gantt`,
+  data: [(representation) => (getType(representation) === 'Gantt' ? GanttRepresentation : null)],
+});
+defaultExtensionRegistry.putData(representationFactoryExtensionPoint, {
+  identifier: `siriusweb_${representationFactoryExtensionPoint.identifier}_deck`,
+  data: [(representation) => (getType(representation) === 'Deck' ? DeckRepresentation : null)],
+});
+defaultExtensionRegistry.putData(representationFactoryExtensionPoint, {
+  identifier: `siriusweb_${representationFactoryExtensionPoint.identifier}_portal`,
+  data: [(representation) => (getType(representation) === 'Portal' ? PortalRepresentation : null)],
+});
+
+export { defaultExtensionRegistry };