But nobody will have mirc.chm unless they happen to have downloaded your file or made their own. Either way it's not from mIRC Co. Ltd. and they have no control over it's content. It's like asking for mIRC to use mirc.net if mirc.com can't be reached when someone clicks the Latest News menu. mIRC already supports CHM files in the Help Files submenu, I don't think it's reasonable to expect anything more than that.
Spelling mistakes, grammatical errors, and stupid comments are intentional.