Achei um site incrível para converter diversos tipos de arquivos. Ele trabalha com muiiitos formatos. São eles:

Textos:
Texto, HTML, XHTML, Microsoft Word, RTF, PDF, PS, Open Office, Star Writer, Pocket Word, Word Perfect, CSV, dBase, Excel, Pocket Excel, Lotus 123, Quattro Pro, Star Calc, Open Office spreadsheet, MathML, Star Math, Open Office math, Powerpoint, Star Impress, Open Office presentation.

Arquivos:
7Z, BZ2, BZA, CAB, GZ, LHA, LZH, RAR, TAR, TGZ, YZ1, ZIP.

Filmes:
3G2, 3GP, AMV, ASF, AVI, DV, FLI, FLV, GIF, GVI, MKV, MOV, MP4, MPG, OGM, RM, SWF, VOB, WMV.
+ video presets for Windows, Linux, Mac, SVCD, DVD, Pocket PC, Mobile phone, Nokia 770, Nokia N800, iPOD, iPHONE, Sony PSP, Nintendo DS, Wii, Zune, S1MP3 MP4 player

Imagens:

AVS, BMP, CIN, DCX, DIB, DPX, FITS, GIF, ICO, JFIF, JIF, JPE, JPEG, JPG, MIFF, OTB, P7, PALM, PAM, PBM, PCD, PCDS, PCL, PCX, PGM, PICT, PNG, PNM, PPM, PSD, RAS, SGI, SUN, TGA, TIF, TIFF, WMF, XBM, XPM, YUV, CGM, DXF, EMF, EPS, MET, MVG, ODG, OTG, STD, SVG, SXD, WMF.

Sons:
WAV => MP3, OGG, AAC, AMR, FLAC, MPC, MMF, AU, AIFF, QCP.
MP3 => WAV, OGG, AAC, AMR, FLAC, MPC, MMF, AU, AIFF, QCP.
WMA => WAV, OGG, AAC, AMR, FLAC, MP3, MPC, MMF, AU, AIFF, QCP.
OGG => WAV, MP3, AAC, AMR, FLAC, MPC, MMF, AU, AIFF, QCP.
AAC => WAV, MP3, OGG, AMR, FLAC, MPC, MMF, AU, AIFF, QCP.
MP4 (AAC) => WAV, MP3, OGG, AMR, FLAC, MPC, MMF, AU, AIFF, QCP.
FLAC => WAV, MP3, OGG, AMR, AAC, MPC, MMF, AU, AIFF, QCP.
MPC (Musepack) => WAV, MP3, OGG, AMR, AAC, FLAC, MMF, AU, AIFF, QCP.
VQF (Yamaha TwinVQ) => WAV, MP3, OGG, AMR, AAC, FLAC, MMF, AU, AIFF, QCP.
REAL AUDIO => WAV, MP3, OGG, AMR, AAC, FLAC, MPC, MMF, AU, AIFF, QCP.
AMR (NB/WB) => WAV, MP3, OGG, AAC, FLAC, MPC, MMF, AU, AIFF, QCP.
MMF (pcm) => WAV, MP3, OGG, AAC, FLAC, MPC, AMR, AU, AIFF, QCP.
AU => WAV, MP3, OGG, AAC, FLAC, MPC, AMR, MMF, AIFF, QCP.
AIFF => WAV, MP3, OGG, AAC, FLAC, MPC, AMR, AU, MMF, QCP.
QCP => WAV, MP3, OGG, AAC, FLAC, MPC, AMR, AU, AIFF, MMF.
3GP => WAV, MP3, OGG, AAC, FLAC, MPC, AMR, AU, AIFF, MMF.
+ Amiga files (8SVF, MAUD), Psion files (PRC, WVE), SNDT, SF, SoundBlaster VOC, AVR, TXW, Soundtracker files (MOD, XM FastTracker, IT ImpulseTracker, S3M ScreamTracker), …

Música e toques monofônicos e polifônicos:
MIDI, MIDI-0, SP-MIDI, CMX, MMF, MOTOROLA, SAGEM, EMELODY, IMELODY, EMS, RTTTL/RTX, NOKIA, NOKIA-TXT

Ele trabalha com arquivos de no máximo 150 MB e é totalmente gratuito e via navegador, isto é, você não precisa baixar nenhum programa para fazer a conversão.

Maysa