Bug 305200 [EditorMgmt] FileEditorMappingContentProvider could just be replaced by ArrayContentProvider
This class doesn't seem to be very useful.
bundles/org.eclipse.ui.ide/extensions/org/eclipse/ui/dialogs/WizardExportPage.java
/**
     * Queries the user for the individual resources that are to be exported
     * and returns these resources as a collection.
     * 
     * @param rootResource the resource to use as the root of the selection query
     * @return the resources selected for export (element type: 
     *   <code>IResource</code>), or <code>null</code> if the user canceled the 
     *   selection
     */
    protected Object[] queryIndividualResourcesToExport(IAdaptable rootResource) {
        ResourceSelectionDialog dialog = new ResourceSelectionDialog(
                getContainer().getShell(), rootResource, IDEWorkbenchMessages.WizardExportPage_selectResourcesTitle);
        dialog.setInitialSelections(selectedResources
                .toArray(new Object[selectedResources.size()]));
        dialog.open();
        return dialog.getResult();
    }
    /**
     * Queries the user for the resource types that are to be exported and returns
     * these types as a collection.
     *
     * @return the resource types selected for export (element type: 
     *   <code>String</code>), or <code>null</code> if the user canceled the 
     *   selection
     */
    protected Object[] queryResourceTypesToExport() {
        IFileEditorMapping editorMappings[] = PlatformUI.getWorkbench()
                .getEditorRegistry().getFileEditorMappings();
        int mappingsSize = editorMappings.length;
        List selectedTypes = getTypesToExport();