This file is created while making the TARGETx.DAT records for the RST files. It contains the targets not fitting into the DOS part of the RST file. You can delete this file after the host run, the host does not always do this itself.
+0 DWORD Number of records +4 n BYTEs Records of 34 bytes each. See RST file description or the KOREx.DAT file format for more information.