Thanks, chrism01 for your links.
After receiving chrism01's links, I did :help in vim. In the first screenfuls you'll see a list of files: usr_NN.txt, NN=01,02,... Then [s]locate any of these files. Within the directory pointed to by locate, grep -irl "non-printable cha" *. In my box, I found options.txt (part of Vim's user manual), with some useful info on non-printable chars stuff.
Last edited by stf92; 12-06-2010 at 04:46 AM.