A family of Microsoft word processing software products for creating web, email, and print documents.
The files sent to me were Word 2 or earlier Binary Documents and to open them in Word that is part of Office 365, it was necessary to change the File Block Settings to allow opening of such files.
An alternative that I have just tested is to open them in Google Docs, which does not have a problem with that file type.
If you have more files that you want to open, I would suggest opening them in Google Docs from where you can then use File>Download>Microsoft Word (.docx) to get them into a format that you can open in Word 2007.