If you have already tried and liked the program
CZ-Doc2Html then, probably, you will also be interested in this CZ-Doc2Htm COM. It is a component for programmers that lets you do the same functions but using Visual Basic source code.
From CZ-Doc2Htm COM you can call on a series of functions (always from the Visual Basic source code) that let you convert Word to HTML, and vice versa. You can also convert plain text (TXT) to HTML, or even enriched text (RTF) to HTML; and also, you can add whole subfolders in order to speed up your conversions, if you want.
In the conversions, if the original file has layers, images and tables, they are also converted in the resulting file. It is advisable to visit the author`s website to see the syntax of each of the functions of this component.