The default format in Word 2007 that documents get saved in is not doc anymore but docx. This has lead to some confusion mainly by those users who still use an earlier version of Word or Office, because those are not able to read docx documents by default.
The article open docx explains how users with older versions of Word are able to open docx documents. It also takes a look at users who do use a different operating system, Linux or Mac, and gives advice to those users as well.
To sum it up. If you do use an older version of Word or Office you could download the Windows compatibility pack. If you use Linux or Mac your best bet would be to use an online converter to convert docx into doc format.
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