I believe he was talking about the naming convention used for folders and such in the OS, not actual code.
When someone comes up with a convention, it is usually for a good reason. Variable naming conventions are vast and varied. MS's happens to be called Hungarian notation. The intent, I suppose, is to lessen the burden on the programmer to go digging the include files to figure out what data type a particular variable is defined as. If all "ints" start with "n", then whenever you see a var that starts with "n", you can go with the assumption that it is an int. Saves time. I prefer a well defined naming convention.