you can nuke the whole file if you don't want any of the cookies.
you can also edit the file in a text editor by just removing individual lines with cookies you don't want, in spite of the warning... but you didn't hear it from me.
oh, and if you use notepad, the lines won't terminate properly, because it's a unix-style text file, but there are plenty of good free editors that handle this just fine... you could try metapad or win32pad if you don't have one you like already.