The .dotx file type is the Microsoft Office Word 2007 or newer template file type, and the .docx file type is the Word 2007 document file type. Converting the .dotx file type to the .docx file type is as simple as saving the template file as a document in Microsoft Office Word 2007 or newer. Word template files are files that provide a predefined format for the document. Open the template file, make any changes necessary to the file and save the file as a Word document.
