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You encountered an .ogg file in a game directory, a Linux distribution, or a Spotify cache folder. Ogg Vorbis was built to be everything MP3 was but without the patents and licensing fees. Technically, it succeeded — Vorbis sounds better than MP3 at equivalent bitrates and costs nothing to use.
Spotify uses Vorbis internally for streaming on desktop. Video games rely on it because the licence is free and the quality is excellent. Firefox and Chrome play it natively in the browser. But Ogg Vorbis never reached mainstream consumer adoption — iPhones don't play it, most portable devices ignore it, and the name "Ogg Vorbis" sounds like a villain from a fantasy novel rather than a sensible technology choice.
VLC plays OGG on every platform. Foobar2000 (Windows) handles it natively. For converting to MP3 (for compatibility) or FLAC (for lossless archiving), fwip does it in the browser. If you care about open standards and your player supports it, OGG is genuinely the better format. If you need to send audio to someone's iPhone, convert to MP3 first.
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