The battle_of_groningen_map.zip file you have requested: Maps Levels Missions / Battle of Groningen - 5.18mb is not available. Perhaps try browsing all files for the game Battlefield 1942: Secret Weapons of WWII and upload any files you want to share or are missing. This is the only information we could locate:
In this map, the Allied need to assault a small village, which is in hands of the Germans. You need to storm the beach, just like at Omaha Beach. There are also much hidden MG42's in this map and an airport. This map is for Secret Weapons of WWII expansion pack.