The wolf_update_1_3.exe file you have requested: Official Releases / Patches / RTCW Patch 1.3 - 7.98mb is not available. Perhaps try browsing all files for the game Return To Castle Wolfenstein and upload any files you want to share or are missing. This is the only information we could locate:
"This update for Return to Castle Wolfenstein addresses issues found in multiplayer and single player since release of Return to Castle Wolfenstein. In addition, we've added new features that will enhance your gameplay experience."