# Set the Character Set During Subfile Extraction

You can convert the character set of a subfile at the time the subfile is extracted from the container and before it is filtered. This is most often used to set the character set of a mail message's body text. See Filter PDF Files for more information.

To specify the source and target character set of a subfile

1. Use the methods of the `ExtSubFileExtractConfig` object to set the source and target character set.

2. Call the `extExtractSubFile` method of the Filter object and pass in the `ExtSubFileExtractConfig` object. For example:

       extconfig = new ExtSubFileExtractConfig();
       extconfig.setSourceCharset(m_sourceCharSet);
       extconfig.setTargetCharset(m_outputCharSet);
       extinfo = m_objFilter.extExtractSubFile(extContextID, i, extconfig);

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