Files that contain the .dotx file extension are Microsoft Word template files. These files are created by versions of Word that were released in 2007 and later. Versions of Word that were released prior to 2007 save these templates with the .dot file extension rather than .dotx.
Microsoft Word is a word processing application. The .dotx files that are created within the application contain default layouts and settings for a Microsoft document. DOTX templates may also include macros, AutoText and toolbar settings. These templates allow a user to use the same layout and format for multiple Word documents without designing each one from scratch.
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