OpenAnyFile
What is a .w64 file?
Sony Wave64 is an audio format developed by Sony, first released in 2002. It is usually created by Sony Vegas, Sound Forge.
A WAV with 64-bit chunk sizes and GUID chunk IDs, created to escape WAV's 4 GB limit.
File details
| Full name | Sony Wave64 |
|---|---|
| Category | Audio |
| MIME type | audio/x-w64 |
| Signature (magic bytes) | 72 69 66 66 2E 91 CF 11 |
| Developer | Sony |
| Introduced | 2002 |
| Opens with | Audio player |
| Uploaded? | No — read locally in your browser |
How to open a .w64 file
OpenAnyFile routes .w64 files to its audio player, which shows a player with duration and seeking, if your browser has the codec.
- Drop your .w64 file on the box above, click it to choose the file, or paste it with Ctrl+V.
- The real format is detected from the file's first bytes — not just its name.
- The file opens in the audio player.
- Use fullscreen for a closer look, check its checksums, or download it back unchanged.
What works — and what does not
Works
Viewing and inspecting: a player with duration and seeking, if your browser has the codec. Size, type, signature and checksums are always shown.
Does not work
Guaranteed playback. It depends on your browser shipping this codec; if it doesn't, you still get the full inspection.
Is it safe to open a .w64 file online?
Here, yes — because nothing is uploaded. Most "online viewers" send your file to their server. OpenAnyFile reads it with your browser's File API and decodes it on your own device, so there is no copy anywhere else. You can check: open your browser's network tab while opening a file — no upload appears.
Questions about .w64 files
Can I open a .w64 file without installing software?
Yes. OpenAnyFile opens .w64 files in your browser using its audio player. You get a player with duration and seeking, if your browser has the codec, with nothing installed and no account.
How do I know a file is really a .w64 file?
Check its first bytes instead of its name. A genuine W64 file begins with 72 69 66 66 2E 91 CF 11. OpenAnyFile shows the detected type, so a renamed file is easy to spot.
Is my .w64 file uploaded anywhere?
No. The file is read locally by your browser and never sent to a server — it even works offline once the page has loaded.
Does it work on phones?
Yes — on Android and iPhone, in any modern browser. You can also install OpenAnyFile as an app.
Related formats
Other formats from the same family:
Format facts checked and page updated on September 25, 2026.