Word Web App cannot open this document due to an unknown error. If the problem persists, try opening the file in Microsoft Word.
Problem : This error usually occurs when you have not configured the service applications after you have installed the office web application package on your SharePoint Farm.
Resolution : Log into your SharePoint Central Administration site, navigate to your service application pages and create a service application for Word, PowerPoint and Excel. Once complete perform a IISRESET (not necessary) and try and re-open your document using Office Web Applications.
I hope this resolution has worked for you as it worked for me.
This was absolutely brilliant. I have spent over two days trudging through various articles etc and can't believe it was this simple.
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