Docx is a free app for Windows 10 PC's that allows users to open Microsoft Word and OpenDocument documents as well as a host of other writing document file types. It's a free alternative to any of the Doc writing programs and allows users to write and edit documents from any source. Like most writing apps it offers a full suite of options in terms of style and formatting as well as the ability to save files in a number of different formats. As a free app Docx does have some limitations versus paid versions but on the whole it works just fine.