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| Name | DOTX | DOCX |
| Full name | DOTX, Word Open XML Document Template | DOCX - Office Open XML Document |
| File extension | .dotx | .docx, .docm |
| MIME type | application/msword | application/vnd.-openxmlformats-officedocument.-wordprocessingml.-document |
| Developed by | Microsoft | Microsoft |
| Type of format | Document | Document file format |
| Description | DOTX files are, like DOT files, template files created by Microsoft's word processing programs. In these template files, information like layout and setting, different styles, AutoText, macros, and toolbars are included. By using a DOTX file, creating documents with the same formatting is made a lot easier. There are DOTX files already generated by the Microsoft Word program, but by altering the so called Normal.DOTX file, the users can create their very own template files for example for business letters or envelopes. | The Office Open XML file formats are a set of file formats that can be used to represent electronic office documents. There are formats for word processing documents, spreadsheets and presentations as well as specific formats for material such as mathematical formulae, graphics, bibliographies etc. |
| Technical details | In contrast to DOT files, files with the DOTX extension use the newer and higher developed XML-based document format of Microsoft Word which has been introduced to the Microsoft Office package in 2007. Thus, DOTX files can be opened by any version of Microsoft Word 2007 and newer, and older versions that support the Open XML component. DOTX files inherit the XML architecture alongside with ZIP compression to keep the file size relatively low. | Office Open XML documents are stored in Open Packaging Convention (OPC) packages, which are ZIP files containing XML and other data files, along with a specification of the relationships between them. Depending on the type of the document, the packages have different internal directory structures and names. |
| Associated programs | Microsoft Word 2013, Apache OpenOffice, LibreOffice | Microsoft Office, LibreOffice, Kingsoft Office, Google Docs. |
| Wiki | https://en.wikipedia.org/wiki/.dotx | https://en.wikipedia.org/wiki/Office_Open_XML_file_formats |