The Vivlio e-readers support the following formats: EPUB DRM, EPUB, PDF DRM, PDF, FB2, FB2.ZIP, TXT, DJVU, HTM, HTML, DOC, DOCX, RTF, CHM, TCR, PRC (MOBI)
The Touch HD Plus and InkPad 3 e-reader models also support audio files in MP3 format (as well as M4B format in the case of the Touch HD Plus).