Microsoft Word for DOS - Yes, you heard me right. I have ANCIENT Microsoft Word files that I need to read

There is a lady who, believe it or not, has been using Word for DOS.  This is like a 1991 program.
Finally her antique-computer croaked.  I WAS able to salvage her 1600 files.
When I try to open them is (a modern version of) Word, I get
  "Select the encoding that makes your document readable"
  "Text encoding"
     "Windows (default)"   or  "MS-DOS"  or  "Other encoding"  (and then a list containg Arabic and Baltic and many more)

I CAN open the files when I choose MS-DOS and I CAN read most of them.
However almost every file has this garbage at the very top:

1¾   «        k              NORMAL.STY                                                          GLYPHIX   @ ¨…Ğ             µ

                                                      5 November 1992





CoreStates Financial Corporation
510 Walnut Street
Philadelphia PA 19106

Actually the garbage looks different in Word but you get the idea.

I guess I need help with:
1) How can I definitively determine which program (or version of Word) created these files?
2) How can I convert them so I don't lose any data - and get rid of the junk at the top.  A (very) few of the files seem unreadable.

Thank you.