Question : xcopy /I not working

I have a very simple line in a script on XP computer.

xcopy "c:\config.xml" "C:\foldername" /I /Q /Y

This is meant to copy that file to that folder (the folder does not exisit), the /I  should confirm it is a directory as a destination and create it. The thing it is still prompting File? or Directory?, why is /I not working?

I know there are many work arounds, create folder first, echo D at beginning of line etc but I would like to kow why this doesn't work.
Thanks

Answer : xcopy /I not working

You need a \ on the end of foldername -

xcopy "c:\config.xml" "C:\foldername\" /I /Q /Y

Lee