You can use the Extractor Checker (transaction RSA3) to check an archive file.
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1. Call up transaction RSA3.
2. Select the DataSource for your archived Object. The name of the DataSource begins with an 8, followed by the technical name of the DataStore object or InfoCube.
3. Choose the option Archive Only to extract the archived data.
4. Select your archive file using the Archive File Selection pushbutton.
5. Start the extraction.