Text editor capable of viewing invisibles?

Question

A recent problem* left me wondering whether there is a text editor out there that lets you see every single character of the file, even if they are invisible? Specifically,

Answer 1

If you are running a 32 bit version of windows, you can see BOMs and other invisible characters such as carriage return or line feeds that look like a music eighth note in MS Dos Editor which you can open by typing "edit" in the run box or from a command prompt. Unfortunately, the ms dos editor is not available on 64 bit systems :(