Ogg files are not as widely supported as mp3s (at the mo') I tend to convert my music files to wma as I use WMP and they are approx 1/2 the size for the same quality. e.g. 128k bitrate for mp3 sounds the same as 64k bitrate wma. A piece of software I tried was 'ACE-HIGH ogg/wma/wav converter' (full version $20) but have started using dbPowermax as it's freeware. You can use it to convert anything to anything (within reason of course) You need to download the 'codec' to have dbPowermax to convert .ogg files but it's a small download and provides it's own links/install.