Yes, I have the same 200MB partition.
During the install you are told that Windows want to create additional partitions. This partition is the home of WinRE (Windows Recovery Eviroment).
You are prompted during install, so if you choose you can cancel the creation of this partition. If canceled, WinRE will be installed on the same partition as Windows.
I guess, this way you can run a diagnostic/repair tool no matter what happens to the partition where windows is installed.
At least this is what I have gathered so far.