It seems to me that you typed xixtrfun.xll with mixed capitalization.
Instead, if you are referring to XLXtrFun.xll, a web search yields www.XLXtrFun.com. On that web site, the system requirements do not mention
Windows Vista, so you may want to contact the author regarding
compatibility.
Yes, I miswrote the add-in name.
But the real question is that it seems there is no way to get an upgraded
version that is compatible with Vista.
That's bad because the add-in is very useful in building spline and pfit
curves.
I wasn’t able to find any alternative on the web, but if you know better
than me, please, let me know.
If not I have to go back to XP.
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