Edit that file using Notepad
I'm not sure if you realise it's binary data and not just plaintext. Notepad will fuck that up completely.
What you should be doing is use COBExtractor to unpack the COB file and edit its' constituent files before using COBExtractor to repack them into a new COB.
You can get COBExtractor here:
http://legolas558.iragan.com/index.p...-MODding-Tools (just click the [V] icon, the detail pages are broken), and
http://www.dosbox.com/wiki/GAMES:Asc..._Modifications has instructions on using it. The Mod Guide explains a bit more about the actual files inside the COB and editing them:
http://legolas558.iragan.com/index.p...ncy-I-MODguide