Sonic Foundry WAVE 64

Writable

audio · also known as Sony Media WAVE 64

W64 is a 64 bit WAV-like audio format created to overcome the 32 bit addressing limitations of conventional WAV.

Identify it

Extensions	`.w64.wav`
Signatures	`726966662e91cf11a5d628db04c10000` at byte 0 (Sonic Foundry WAVE 64)
PRONOM	`fmt/951`
Wikidata	`Q27960118`

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Open it

FFmpegOpen sourcereads and writes · LGPL-2.1-or-later / GPL-2.0-or-later
Free Lossless Audio CodecOpen sourcereads and writes · 3-clause BSD License / GNU General Public License, version 2.0 / GNU Library General Public License, version 2.0
libsndfileOpen sourcereads and writes · GNU Lesser General Public License
Q3898244Open sourcereads · BSD licenses / GNU General Public License / GNU Lesser General Public License
EZ CD Audio Converterreads and writes
Video Factoryreads and writes
Awave Studioreads
Q300915reads · freeware

Convert it

To	With	Fidelity	Command and losses
FLAC (Free Lossless Audio Codec) 1.2.1	FFmpeg	Lossless	`ffmpeg -i in.w64 out.flac` Lossless for decoded audio; a lossy source stays as degraded as it was. WAV may reduce bit depth or drop metadata.
Waveform Audio	FFmpeg	Lossless	`ffmpeg -i in.w64 out.wav` Lossless for decoded audio; a lossy source stays as degraded as it was. WAV may reduce bit depth or drop metadata.
Matroska 1-4	FFmpeg	Lossy	`ffmpeg -i in.w64 out.mkv` Re-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container.
MPEG 1/2 Audio Layer 3	FFmpeg	Lossy	`ffmpeg -i in.w64 out.mp3` Lossy re-encoding.
MPEG-4 Part 14	FFmpeg	Lossy	`ffmpeg -i in.w64 out.mp4` Re-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container.
Ogg	FFmpeg	Lossy	`ffmpeg -i in.w64 out.ogg` Lossy re-encoding.
WebM	FFmpeg	Lossy	`ffmpeg -i in.w64 out.webm` Re-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container.

Sources

From Converters (FFmpeg, ImageMagick, Pandoc, LibreOffice), Just Solve the File Format Problem (File Formats Wiki), PRONOM, Wikidata. Updated 2026-10-24.

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