You can open a document saved in another format by using the following procedure:
Choose File - Open.
Select a format from the Files of type list box.
Select a file name and click Open.
If you always want the file dialogue boxes to show another format by default, choose Tools - Options - Load/Save - General and select that format as Default file format.
Open the wizard, which guides you through the operation, to copy and convert all documents from Microsoft Word, Microsoft Excel or Microsoft PowerPoint into OpenDocument file format documents. You can select a source and target directory, specify whether to convert documents and/or templates, and more besides.
Choose the file type "HTML Document" to open in Office Writer/Web. This is the default for HTML documents in Office.
All the options of Office Writer/Web are now available to you, such as Show HTML source.
Choose "HTML Document (Office Writer)" to open in Office Writer.
All the options of Office Writer are now available to you. Not all options that Office Writer offers for editing of documents can be saved in HTML format.