Bleeping Computer's Business Application area...
this appears to be the proper area...
but since you have already posted here...
what version of office/word are you using?
by field codes do you mean non-printing characters?
like paragraph marks, tabs and spaces?
those you can reveal by:
tools menu, options, view, and basically check every
box in that window, click ok and look at your document
again... hopefully this is what you are looking for.
(these instructions are from Word 2000... they might
be different for your version... or not)