dtsExtractionOptions (attached to a dtsFileConvertJob2) specifies how embedded images and attachments should be handled.

struct dtsExtractionOptions {
  int flags;
  const char * outputLocation;
  const char * outputReference;
  const char * outputFileListName;
  const char * filenamePrefix;
  const char * unnamedAttachmentLinkText;
  const char * allowedExtensions;
  const char * defaultExtension;
};