.OGA File Extension

Audio container format that may use one of several encoding schemes, including Ogg FLAC, Ghost, and OggPCM; may also use Ogg Vorbis or Speex compression, although these codecs are not recommended by Xiph.Org due to some compatibility issues (the .OGG extension should be used instead for Ogg Vorbis and Speex).

Xiph.Org, the developers of the OGA format, have released a DirectShow codec pack that allows developers to include OGA support in open-source and commercial Windows applications.

NOTE: Ogg Vorbis audio files more often use the OGG file extension.