VirtualBox Windows XP Guest File Sharing

How to share files hosted on a Windows XP VirtualBox guest on a Mac OS X host to a real Windows XP computer.

1. Plug in Thunderbolt Ethernet adapter to host Macbook Air.
2. Connect Ethernet cable between client computer and host Mac.
3. Mac Host > Network Preferences > Thunderbolt Ethernet
   
   1. Configure IPv4: Manually
   2. IP Address: 10.11.0.1
   3. Subnet Mask: 255.255.0.0
4. VM Settings > Network settings > Adapter [n]
   1. Attached to: Bridged Adapter
   2. Name: en3: Thunderbolt Ethernet
5. Guest VM > Network Connections > Wired network > Properties >
   1. Internet Protocol (TCP/IP)
      1. Check Use the following IP Address or Alternate Configuration
      2. IP Address: 10.11.0.2
      3. Subnet Mask: 255.255.0.0
   2. Advanced > Windows Firewall > Settings > Exceptions > Check File and Print Sharing.
6. Client computer > Network  Connections > Wired network > Properties > Internet Protocol (TCP/IP)
   1. Check Use the following IP Address or Alternate Configuration 
   2. IP Address: 10.11.0.3
   3.  Subnet Mask: 255.255.0.0
7. (Optional test) Ping from each computer to the others.
8. Guest VM > Share a folder
   
   1. Make folder C:\share
   2. Right click folder > Properties
   3. Check Share folder on network.
9. Client computer > My Network Places > share on Guest VM
10. Done