The sis file provided on the release page includes a recogniser so that ogg file will be recognised and played by the Recorder program built into the phone. The recogniser will also mean that ogg files are included in the drop down list that appears when selecting ringtones (e.g. in the Contacts application when specifying a unique ringtone for a contact).
This means you can now write applications that use OGG Vorbis without having to write your own OGG Vorbis decoder.
The OGG Vorbis Controller was developed at Symbian and is available here.
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