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
if (source instanceof IFile) {
            source = ((IFile) source).getParent();
            setResourceToDisplay((IResource) source);
        }
        Object[] newlySelectedResources = queryIndividualResourcesToExport(source);
        if (newlySelectedResources != null) {
            selectedResources = Arrays.asList(newlySelectedResources);
            displayResourcesSelectedCount(selectedResources.size());
        }
    }
    /**
     * Queries the user for the types of resources to be exported and
     * displays these types in this page's "Types to export" field.
     */
    protected void handleTypesEditButtonPressed() {
        Object[] newSelectedTypes = queryResourceTypesToExport();
        if (newSelectedTypes != null) { 
            List result = new ArrayList(newSelectedTypes.length);
            for (int i = 0; i < newSelectedTypes.length; i++) {
				result.add(((IFileEditorMapping) newSelectedTypes[i])
                        .getExtension());
			}
            setTypesToExport(result);
        }
    }
    /**
     * Returns whether the extension of the given resource name is an extension that
     * has been specified for export by the user.
     *
     * @param resourceName the resource name