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What is the file compatibility between Version 4 and Version 3?

April 26, 2017compatibility file version

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What is the file compatibility between Version 4 and Version 3?

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There is upward compatibility with version 3 files (.rca type) safely opened and converted (.arca type) by saving them (Save As) in version 4. The original files can be kept and used as needed in the older version. In short the version 3 files can be viewed in both while the version 4 files are unable to be used in an older release.