In order to edit topics using the integrated Topic Editor, they must be contained in an UTF-8 or ASCII encoded source or topic file. Files in different encodings (Ansi, UTF-16, UTF-32) are parsed and processed but their content can't be edited directly. When opening a project (as well as on each subsequent project update), Doc-O-Matic automatically verifies the encoding of source, DTX and snippet files and offers to convert them to UTF-8. The UTF-8 conversion is completely optional. 

When viewing a topic whose file encoding is incompatible, Doc-O-Matic offers a convenient way to convert the encoding of that file with just a single click, right in the editor.