huhu i understand U bro!
anyway... sometime ago, i hit with the same problem, the solution? NOTEPAD++ or notepadpp for the plus, you must define the assemply highlight words in notepad++ (or find some highlight definition in the web) once your code seems nice, you can use the npp plugin NppExport to export the code in RTF or HTML, both with full -syntacs highlight....
i think the scite text editor also has an export to rtf option, (and also the programmers notepad for AVR C and assembler)
sorry i couldn't find some easier solution... but i did go this way...