Sure
1. select 1 from dual
2. Press "Export query results...", select "Excel file"
3. When selecting file type stay with "XLS-files", enter file name blahblahblah, then save.
4. The resulting file is blahblah.xlsx, not xls
5. Click to open it, you'll see "Excel cannot open the file "blahblah.xlsx" because the file format for the file extension is not valid. Verify that the file has not been corrupted and that the file extension matches the format of the file"