Files ending in DOCHTML are HTML files created by previous versions of Microsoft Word. Word, Microsoft Corporation's standard text processing, usually stores documents as doc or docx files. To view his documents in a browser, the user can save his document as a DOCHTML file.
This file then contains normal HTML source code similar to an html file. The source code is designed in such a way that the browser displays the document as much as Word.
The DOCHTML format is no longer supported by Microsoft. Documents that should be published on the Web should therefore be saved as an mhtml or mht file.
Newer versions of Microsoft Word save HTML code as an html file.