Everything points to the fact that Sony ATRAC3 audio files (.at3) can be exported to FLAC format (.flac or .fla) using Sound Forge program. Unfortunately, we do not know about any other program capable of at3 to fla conversion, so using the original program is most likely your only option.
Home > Search converters: at3 to fla
Conversion of at3 file format to fla file format beta
Search for at3 to fla converter or software able to handle these file types.
Convert Sony ATRAC3 audio to Audio files encoded by Flac - free lossless audio codec.
We have found one software suitable in our database for this conversion.
Microsoft Windows software 
- convert at3 to fla on Windows
Sound Forge
A digital audio editing software from Sony
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from at3 file | No | Yes | Yes | at3 editor | Yes | No | No | No |
to fla file | Yes, Sound Forge supports fla file conversion as a target file type. | Yes | Yes | fla editor | No | No | No | No |
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.
Additional links: Open at3 file, Open fla file
AT3
Files with at3 file extension was also sometimes used for Sony ATRAC audio format. No longer actively used.
FLA
A fla file extension is associated with the FLAC - Free Lossless Audio Codec. FLAC is open-source audio format that uses lossless audio compression, meaning it does not remove any of the original audio data - compresses audio with no loss in quality.
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