Try copying the file back to your hard disk - using MS DOS copy command if you must (it's easier to use Explorer) and open it from there. If that doesn't work, try renaming it to something else and opening the renamed file (open in Word).
Like DieSse, I can't understand the pre-occupation with MS-DOS in this matter. What does worry me a bit is that I thought that Word went from 97 to 2000 without stopping in the intermediate years - but maybe I'm wrong. We are talking Word 98 rather than Windows 98 aren't we claire27?