You can open documents in following file formats:
Text Speaker can save changes to documents in DOC, DOCX, PDF, RTF and Text formats but not to HTML files. If you edit an HTML file, you can save your changes in one of the other formats. When opening a PDF file, graphics are not imported. On editing and saving a PDF file, the graphics and some formatting information will be lost.
When you want to convert your documents to audio, you can save to WAV and MP3 formats.