Hi Vincent - the bootloader is Windows 7.
At least, I think it is, I have used EasyBCD for boot editing, and I know it has its own bootloaders, such as neogrub.
The order of installation was XP, Windows 7 - but using imagex to apply the image from the Windows 7 install.wim, and then bcdboot from WinPE to write the BCD boot store. I used the same technique to install Windows 8 CP - it avoids the awful Windows 8 bootloader and multiple reboots when using an OS other than Windows 8.
Later I installed Ubuntu from within windows, but strangely, the installation failed from both XP and from Windows 7 - only when I tried Windows 8 to install Wubi did the installation complete successfully.
Again in Windows 8, I launched Mint4win, and the first dialog said that it was about to uninstall Ubuntu - so I cancelled it.