When you right-click on a .dll, you can choose properties, and on the version tab these are the correct details...
For XP SP2 version 2001.12.4414.258 792,064 bytes, dated 04Aug04 time 00:56
For XP SP3 version 2001.12.4414.700 792,064 butes, dates 14Aug08 time 01:11
One good way to install this thing properly, therefore, is to install SP3