Could someone please tell me the correct method of locating a file through ifstream. This it my attempt, which doesn't seem to be working.

Code:
  //Opens for reading the file
  ifstream b_file ( "C:\Program Files\FAH\unitinfo.txt" );
  //Reads one string from the file
  b_file>> str;
  //Should output 'this'
  cout<< str <<"\n";
Thanks,
Gareth.