Hi i also had the same problem, I was trying to open a attached document from my hotmail account and it wouldn't open onto microsoft word. The file was saved as pdf. I spent ages but OMG one website that actually worked!!!! couldn't believe it, and theres no need to enter no registration details or any personal information! so that was brilliant! i got this website on my favourites now
this is the link.
All it needs is the document you want to open so browse for the file then it will ask what format you want to save it as, rich text format or DOCX then it ask for your email address and within a few minutes you will get a email from them with your file attached and your able to open it and read it in word!!!! honestly worked! really good website to keep for the future!