<oXygen/> XML Author offers support for a wide variety of file types, but users are free to add new file types specified by extension and associate them with the editor type which fits better. The associations set here between a file extension and the type of editor which opens the file for editing have precedence over the default associations available in the dialog. →
The File Types preferences panel is opened from menu File Types
→ +The file types table can be edited to add the following information:
The new file types.
The type of editor which the extensions will be associated with. Some editors provide easy access to frequent operations via toolbars (e.g. XML editor, XSL editor, DTD editor) while other provide just a syntax highlight scheme (e.g. Java editor, SQL editor, Shell editor, etc.)
If the editor set here is not the XML Editor then the encoding set in the preference Encoding for non XML files is used for opening and saving a file of this type. This is necessary because in case of XML files the encoding is usually declared at the beginning of the XML file in a special declaration or it assumes the default value UTF-8 but in case of non XML files there is no standard mechanism for declaring the encoding of the file.
You can also decide the files which will be treated as DITA Maps when opened in Oxygen. If the files match the pattern you will be prompted to open them in the DITA Maps Manager.