At first glance, it may seem like that “X” is merely a change in naming conventions, a minor inconvenience because you need to have a recent version of Word to use it. In actuality, that “X” signifies improvements to the file format that benefit everyone from authors to engineers. Think of it as a newer, mightier version of an application you love.
So, what makes .docx so mighty? For one, it reduces file sizes by as much as half of .doc. Smaller file sizes mean files are transferred and opened faster. Also, .docx is a more static format, so it’s harder to corrupt the file as you collaborate with others. When it comes to security, .docx has .doc beat again, as it eliminates the worry of macro-viruses. Finally, .docx was designed for whatever comes next in technology. It’s structure is based on a more open standard file format for Microsoft, letting users easily craft applications to access data within Word documents (to transfer to a webpage, for example), and also to make it simpler for other word processing software to open Word documents.
With Nitro Pro 9, all PDF to Word conversions will be, by default, set to .docx. If you currently use Microsoft Word 2003 or earlier versions and wish to convert to .doc, you will also be able to change your settings in the preferences, as shown below.

No matter what type of file, Nitro Pro is determined to make documents easier than ever. Check out some other great Nitro Pro 9 features here.