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.AC3 File Extension

Dolby Digital AC-3 Compressed Audio File

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Description:
AC-3 is a lossy audio compression technology created by Dolby Laboratories. AC-3 can encode up to 5.1 channels of audio in a .A52 file (left, right, center, left surround, right surround, subwoofer).

Free programs to use .AC3 files:

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Songbird can open and play .AC3 files
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