In Lost World - Vista: Why is my file at Program Data being Virtualized ?

I am working on Vista. I have a file which is stored in Program Data (not Program Files).
It reads the file from the location, and when I try to save the same after editing... windows dose'nt allow me.

I found that, windows is virtuilazing the same to the current users virtual store. This confuses me.
I thought the rightful place for such files was (Program Data) <%ALLUSERSPROFILE%>\Application Data\.

Maybe someone here could help me out with this.


Path of file is....
<%ALLUSERSPROFILE%>\Application Data\....