Export folders

I wanted to export a folder of many lists for a friend who is also using BaseCamp. Unfortunately when I do this, at least as a GPX file, the folder structure is not preserved. Short of sending him my entire backed up database, is there any way to export and preserve the structure?
  • BaseCamp now allows you (at least in the Windows version, afraid I don't know if the mac does the same?) to run more than one database, so if I wanted to do what you're wanting I'd create a new database, containing just the folder/lists required, back that up and then send it to anyone who requires it.