Sometimes I have to download some Word or Excel documents from uncredible sites. I need not only to read but also to edit them. I heard that the Microsoft Office suite is a very popular attack vector. Although I patch my Windows and Office regularly I guess there must be many 0day vulnerabilities in them.

In order to mitigate the risk, after downloading a Word document, I would upload it to Google Docs, make some small changes and download it with a different format (for example, if the original file is a \*.doc file then I would download it as a \*.docx file and vise versa). My guess is that such conversion may "sanitize" (or at least break) the malicious code (if any) in the suspicious file. 

Does anyone know whether it works?