Word2013 – How to resolve the problem "Word experienced an error trying to open the file" when opening a Word 2007/2010 file

Having rolled out office 2013, I thought it was plain sailing until I received some documents from a customer and could not open them. I kept getting this error message.

Some research led me to this excellent MS article.

http://support.microsoft.com/kb/2749199 

Worked a treat for me. In my case, I added the root location where I keep my documents as Trusted location.

Hope this helps.