# 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 character set of a subfile, call the fpExtractSubFile() function, and set the `KVExtractSubFileArg->srcCharset` argument to any value in the enumerated list in `KVCharSet` of `kvtypes.h`.

To specify the target character set of a subfile, call the `fpExtractSubFile()` function, and set the `KVExtractSubFileArg->trgCharSet` argument to any value in the enumerated list in `KVCharSet` of `kvtypes.h`.

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