I got the same error since i upgrade my alfresco community 5.2 -GA for 6.1.2 -GA , strangely the format of microsoft word documents (doc, docx, ppt, xls) changed to the format application/vnd.openxmlformats-officedocument.wordprocessingml.document' and i cannot preview documents on alfresco share.
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Well, there definitely is some reason, just not a good one. Microsoft inconveniences everybody that uses their crap. Office is only getting worse. The Windows user-experience is getting worse. Outlook is getting worse. Instead of fixing problems, they throw in new features and make the thing overall worse. It really is corporate dysfunctionality all the way down and with probably no way to fix it. As soon as an enterprise has a quasi-monopoly, its products become crap.
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