XWMA to AU Converter
FileFlip converts XWMA to AU entirely inside your browser, using FFmpeg compiled to WebAssembly. The file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. That means no file-size limit, no queue and no account.
How do I convert an XWMA file to AU?#
- Drop your XWMA file onto the converter at the top of this page, or click it to pick one from your computer. You can add as many as you like.
- Leave the target set to AU and the conversion starts on its own. FileFlip downloads 30.8 MB of WebAssembly the first time and nothing after that, then runs FFmpeg on your own machine.
- Save the AU file. Your browser writes it straight to your downloads folder, because there was never a server holding it.
Does converting XWMA to AU lose quality?#
It depends on what is inside the file. XWMA is a container rather than a codec, so whether the AU conversion copies the streams across untouched or re-encodes them is decided by the codecs that particular file happens to use.
Is it safe to convert XWMA files online?#
Yes, because nothing is uploaded. FileFlip converts XWMA files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What XWMA to AU actually does to the file#
Converting XWMA to AU runs on FFmpeg, downloads 30.8 MB of WebAssembly the first time and nothing after that, re-encodes or copies through depending on the codecs in the file, and drops encoded streams.
| Engine | FFmpeg |
|---|---|
| Conversion path | One step: XWMA → AU |
| Downloaded to your browser | 30.8 MB, once, then cached by your browser |
| Quality | Decided by the codecs inside the file |
| You get back | One file |
| Where it runs | In a background worker, so the page stays responsive |
What survives the conversion
| What is in the file | This conversion | Why |
|---|---|---|
| Encoded streams | Dropped | The target format has nowhere to put it. |
What is an XWMA file?#
An XWMA file holds audio compressed with Microsoft's WMA codec inside a RIFF container variant built for XAudio2, the low-level audio API Microsoft supplies to Xbox and Windows game developers, so the format appears almost exclusively as a game asset rather than as a general music file.
XWMA belongs inside a game's own audio pipeline, built with XAudio2, where its job is efficient streaming playback rather than general storage.
Convert XWMA to WAV or MP3 when working with audio extracted from a game, such as for modding, preservation, or listening to a soundtrack outside the game itself.
What is an AU file?#
An AU file holds audio in Sun Microsystems' Unix workstation format, a plain header followed by raw sample data that was the standard system-alert and early web audio format before WAV and MP3 took over.
AU still shows up as the format Java's javax.sound and some Unix system tools default to for short sound effects, where its simplicity is the point.
Convert AU to WAV or MP3 when the audio needs to play in modern media players, browsers, or editing software that no longer ship AU support by default.
XWMA to AU questions people ask#
What creates an XWMA file?
XWMA files come from game development tools built on Microsoft's XAudio2 API, and from extracting audio assets out of Xbox 360 and Windows games that used XAudio2 for their sound. It is not a format any general recording or editing software produces on its own.
What plays XWMA files?
VGMStream, the game-audio playback tool, decodes XWMA directly, and its plugins let foobar2000 and Winamp play it too. Ordinary media players do not recognize the format, since it was built specifically for XAudio2, not for general playback.
What should I convert an XWMA file to?
Convert XWMA to WAV to preserve full quality for editing, or to MP3 for a smaller file to listen to outside the game it came from. Either target opens in ordinary media players and editors, unlike the original XWMA file.
What creates an AU file?
AU files come from Unix and Sun workstation software, from Java's built-in sound APIs, and from older system sound effects, since AU was the default audio format on SunOS and NeXT machines. Websites in the 1990s also used it for embedded sound clips before WAV and MP3 became standard.