the entity files in your sins\gameinfo are in bin mode.
I have written a little gui to use the convertdata's that come with sins/entrenchment/diplomacy to convert files between editable(txt) and quickloading(bin). you can download it from either of the download links in the textbin gui thread
there is also two other utilities that can convert the files between txt & bin ie hoho50000's & dekanriks, both of their threads are in the modding area
once the entity's are in txt mode ANY plain text editor like notpad and notpad++ will allow you to make the changes you want in the files
hope this helps
harpo