The phms_hauptquartier.zip file you have requested: Maps / Single Player / PHM's Hauptquartier - 17.91mb 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:
The missions are explained in detail at the mission briefing and in the note book. Besides, the first mission advices are printed via the console at certain times.