See http://support.microsoft.com/?kbid=222330. But the original Word document should be there also. Contact your friend if it isn't. Then let him send the document as an attachment from his e-mail program, not from Word with File/Send To.
Let him consider a free or shareware zip/unzip program to compress the file, so that it fits on a diskette. Word documents compress to about 15%, if they don't contain pictures. So you can easily put a 8 Mb Word file on a diskette.
But beware diskettes are unreliable, and not fit for long term storage. CD is better for that.
A friend has emailed me a short story which he has written, asking me to burn it on to a cd for him, as it is too large to fit on a floppy. It has arrived as an oledata. mso file, with a header.htm attachment as well. I have never encountered this file extension before, and would like an explanation please.