NIS 2011: Program Control does not see an executable I want to add

I want to add the following executable to the Program Control list:

 

C:\Windows\System32\enstart64.exe

 

If I go to My Computer and drill down to the path above, I find the file.  If I do a search of my C: drive for the filename, it shows up in the results.  But when I go into NIS 2011>Settings>Network Settings>Smart Firewall>Program Control>Configure, and then click on Add and Browse, the file is not in the list, regardless of whether I filter by executable or All Files.

 

The is Windows Ultimate 64 bit with NIS 2011.