The DOT file extension is associated with Microsoft Word, a word processing application. DOT files are used in Microsoft Word 97 to 2003 for document template files. DOT file contains pre-formatted document settings, such as headers, margins, font sizes,footers, and other common page styles. The Normal template Normal.dot stores the default document template.
The DOT file extension is associated with Graphviz, an open source graph visualization software, originally developed by AT&T Labs Research. DOT file is saved in a plain text format and used for visualizing relationships between entities.