The EtherCAT XML files contain configuration data for EtherCAT communication. In LabVIEW 2013 SP1 the XML file moved so that it can be version-dependent (i.e., have different XML files for different versions).
If you are using an NI EtherCAT Slave and the file is not present in the folder after importing, the NI-Industrial Communications for EtherCAT driver may be corrupted. Reinstall the driver
to resolve this.