My god hexing your client couldn't be easier, you have to be kidding me.
I'd do these for you guys, but hosting exe's is annoying, and I'm not going to upload 5.26MB every time.
Download HEX Edit.
Download localhost (You can find it like anywhere here, I believe the link is above)
Right click localhost.exe and choos eopen in HEX Edit.
Press CTRL+F (Find)
Type: Text String, Value: 127.0.0.1
Press Enter or click on "OK"
Put your mouse on the left of the 127, and start typing in your address.
You will find 127.0.0.1 three times (All next to each other), replace all 3 with your IP.
Now for the website
Ctrl+F again
Type: Text String
Value:
MapleStory Patcher
Replace that with your website, blanking out anything that's after (NOT DELETING, simply blanking out, with SPACES)