Spotlight does not find file I have the file Rprofile.site in /Macintosh HD/Library/Frameworks/R.framework/

Searching 'Rprofile.site' in Spotlight does not find the file, and I have to manually go to the folder containing the file.

I'm on a Mac book pro using 10.8.2

Is there a way I can find the file using Spotlight?
The problem is some folders are intentionally left out from the global spotlight search on the menubar.

For example, /Library and /Users/*/Library, one of the ways to search in these directories is to navigate to these directory in Finder, and search in the Spotlight field in the upper-right corner.