Files ending in DOCMHTML are MIME HTML files created by earlier versions of Microsoft Word. Among other things, these files contain HTML source code similar to an html file. The source code is created in such a way that the browser displays a doc or docx document as similar as possible to Word. Docmhtml files may also contain other resources such as images or audio files.
The DOCMHTML 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.
Mozilla Firefox needs to display a MHT plugin.
Most often resolving problems with opening DOCMHTML files is very simple. Just install an appropriate program that supports such files. All of the listed programs support DOCMHTML files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of DOCMHTML files or offer file conversion options, but may not be capable of editing such files.
It is possible that although a compatible program has been installed on user’s system, it is not used by the system to open it. This may happen because no default application was associated with this type of files. To associate DOCMHTML files with given application, select "Open with" from drop-down menu (accessed by right-clicking on the file). Then select from the list the program or application you want to be used to open this type of file. If the Microsoft Word applications is not on the list, select "Browse" option in order to manually locate the directory where Microsoft Word has been installed.
Sometimes problems with opening DOCMHTML files may not lie with the application itself, but can arise due to other causes, such as: