The Open command can be used to open files to translate in general – quite like the Open command of Word itself. However, there is an important difference: If you want to translate HTML documents, you should NOT open the HTML files like a normal Word document through the Word menu command File | Open. Rather, you should use the Open command of MetaTexis. For only then are the HTML documents opened as text documents. And only if this is the case, the translation of the HTML file will have exactly the same format as the original HTML document.
If you open an HTML document with the Word command to open files, the HTML document will be converted into a Word document (or, if FrontPage is installed on your computer, the document will be opened in FrontPage). You can translate the converted document with MetaTexis. However, if the final version is supposed to have the same HTML code as the original document, this is not recommended, because Word produces a complex HTML code (optimized to make HTML pages look like Word documents).