When exporting crawled documents to a file system, by default, Content Analytics  exports content as  .dat  files  and  preserves the binary format of the file. For  example, you export a  .doc  source file in the  .dat  format and rename the  .dat format to the  .doc  format. In this case, the resulting  .doc  file is the same as the  original  .doc  file. However, when you export to a  .csv  file, the binary content of  the document is not exported.  When you configure the export of crawled content for Content Collector  integration, Content Analytics preserves the extension from the source (if  available) and exports content with the original extension. For example, if the  source document has the document  sample.doc  file, the exported content also  has the  sample.doc  file name. For situations where Content Collector integration  is enabled, but the source document does not provide a file extension, the  document is exported as a  .dat  file. When you configure Content Analytics to export content to a file system, the  name of the XML file begins with  0000.dat  and increments sequentially. For  example, if the source file is the  sample.doc  file, the metadata file name is  0000.dat  or  0000.doc  if Content Collector integration is enabled. Binary content is stored in the relational database as a binary large object  (BLOB). CAS is a data structure for representing information that is gathered during the  analysis of document such as annotations, tokens, and facets. When you export  the CAS format to a file system, the data is exported in the XMI format as  .xmi  files. The CAS format conforms to UIMA standards and is subject to change with  future releases of UIMA. When Content Collector integration is enabled, the format of the CAS file does  not change. The name of the XMI file begins with  0000.xmi  and increments sequentially until  the name reaches  9999.xmi . When more than 10,000 documents are exported, a  new folder is created with file names beginning with  0000.xmi . CAS export to relational database is not supported. Binary content file name Binary content in the relational database 10.3.4 Common Analysis Structure format Common Analysis Structure file name Common Analysis Structure in relational database  Chapter 10. Importing CSV files, exporting data, and performing deep inspection  361