WlanGetProfile

[DllImport("wlanapi.dll", SetLastError = true)]
public static extern uint WlanGetProfile(
   IntPtr hClientHandle,
   ref GUID pInterfaceGuid,
   [MarshalAs(UnmanagedType.LPWStr)] string strProfileName,
   IntPtr pReserved,
   [MarshalAs(UnmanagedType.LPWStr)] out string pstrProfileXml,
   ref WLAN_PROFILE_GET_FLAGS pdwFlags,
   IntPtr pReserved2
);

Microsoft documentation: Link

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