Excel 2010 : Spline or Interpolate function for 2010

Hi,
In one of the threads " Excel 2007 : Spline or Interpolate function for 2007" I saw, interpolation functions can be used in excel.

Interpolation functions like spine() and others can be used using "XlXtrFun.xll" (link from old thread "http://www.ozgrid.com/Excel/excel-in...-curve-fit.htm")

But the read me file(ReadMeXlXtrFunAndSurfGen.htm) says it can be used till Excel 2000. I want to use interpolation functions in excel 2010. Kindly guide me on how to use it in excel 2010.

One more point to add...

Read me file says we can use in following OS(Windows 95, 98, Me, NT 3.51, NT 4.0, 2000, XP). But if we have Windows 7 can we use it?