Use XRCT 1.10 together with the official XRCatTool.exe – extract with XRCT, modify files, then repack with the official tool.

Choose an empty destination directory (e.g., C:\XR_Extracted\ ).

: Ensure your file paths do not contain spaces, or wrap the entire directory path in quotation marks ( "" ).

: Modders use the tool to "unpack" the game's core files. For example, loading 08.cat allows you to access aiscripts or libraries to see how the game’s logic functions.

The X Rebirth Catalog Tool (now updated as part of the X Tools suite) is an official Egosoft utility essential for modders to extract and compile game data files for both X Rebirth and X4: Foundations . It provides both a GUI and command-line interface for managing .cat and .dat files, though it requires an Egosoft forum account for access. For more details, visit Egosoft . X Catalog Tool - X Community Wiki