This is very important. Anything older, such as Windows 3.1, use an 8 letter name. Add a suffix. The document names are different because IBM compatibles only allow 3 letters after the dot. MAC machines allow four.
Browsers allow both suffixes.
They see them as the same. If you haven't already done so, or you've made a change, save your document now. This test will confirm that you have successfully followed the instructions up till now and confirm your understanding of this very basic information. If the floppy disc containing your document is not currently in the floppy drive, place it there. You will see OPEN, OPEN FILE, or some other the equivalent words, depending on your browser.