i look at playguide on server side and there is only this
//Level
0
1
2
3
5
6
8
10
11
12
13
15
20
25
40
50
60
80
150
180
220
380
400
end
and that's what is there
but should look like that
<PlayGuide>
<Guide OpenLevel="0" URL="http://image.webzen.kr/Mu/images/event/20140418_ingame_guide/ingame_guide_main.html" />
<Guide OpenLevel="1" URL="http://image.webzen.kr/Mu/images/event/20140418_ingame_guide/ingame_guide_sub01.html" />
<Guide OpenLevel="2" URL="http://image.webzen.kr/Mu/images/event/20140418_ingame_guide/ingame_guide_sub02.html" />
<Guide OpenLevel="3" URL="http://image.webzen.kr/Mu/images/event/20140418_ingame_guide/ingame_guide_sub05.html" />
<Guide OpenLevel="5" URL="http://image.webzen.kr/Mu/images/event/20140418_ingame_guide/ingame_guide_sub03.html" />
<Guide OpenLevel="6" URL="http://image.webzen.kr/Mu/images/event/20140418_ingame_guide/ingame_guide_sub06.html" />
<Guide OpenLevel="8" URL="http://image.webzen.kr/Mu/images/event/20140418_ingame_guide/ingame_guide_sub07.html" />
<Guide OpenLevel="10" URL="http://image.webzen.kr/Mu/images/event/20140418_ingame_guide/ingame_guide_sub04.html" />
<Guide OpenLevel="11" URL="http://image.webzen.kr/Mu/images/event/20140418_ingame_guide/ingame_guide_sub08.html" />
<Guide OpenLevel="12" URL="http://image.webzen.kr/Mu/images/event/20140418_ingame_guide/ingame_guide_sub09.html" />
<Guide OpenLevel="13" URL="http://image.webzen.kr/Mu/images/event/20140418_ingame_guide/ingame_guide_sub10.html" />
<Guide OpenLevel="15" URL="http://image.webzen.kr/Mu/images/event/20140418_ingame_guide/ingame_guide_sub11.html" />
<Guide OpenLevel="20" URL="http://image.webzen.kr/Mu/images/event/20140418_ingame_guide/ingame_guide_sub12.html" />
<Guide OpenLevel="25" URL="http://image.webzen.kr/Mu/images/event/20140418_ingame_guide/ingame_guide_sub13.html" />
<Guide OpenLevel="40" URL="http://image.webzen.kr/Mu/images/event/20140418_ingame_guide/ingame_guide_sub14.html" />
<Guide OpenLevel="50" URL="http://image.webzen.kr/Mu/images/event/20140418_ingame_guide/ingame_guide_sub15.html" />
<Guide OpenLevel="60" URL="http://image.webzen.kr/Mu/images/event/20140418_ingame_guide/ingame_guide_sub18.html" />
<Guide OpenLevel="80" URL="http://image.webzen.kr/Mu/images/event/20140418_ingame_guide/ingame_guide_sub17.html" />
<Guide OpenLevel="150" URL="http://image.webzen.kr/Mu/images/event/20140418_ingame_guide/ingame_guide_sub19.html" />
<Guide OpenLevel="180" URL="http://image.webzen.kr/Mu/images/event/20140418_ingame_guide/ingame_guide_sub18.html" />
<Guide OpenLevel="220" URL="http://image.webzen.kr/Mu/images/event/20140418_ingame_guide/ingame_guide_sub19.html" />
<Guide OpenLevel="380" URL="http://image.webzen.kr/Mu/images/event/20140418_ingame_guide/ingame_guide_sub19.html" />
<Guide OpenLevel="400" URL="http://image.webzen.kr/Mu/images/event/20140418_ingame_guide/ingame_guide_sub19.html" />
</PlayGuide>
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I think your best bet is to use a debugger and look into the client for website strings. Yes, it's possible that S18 could have a mini browser implemented but not necessarily. It can just get the image or text by an API or directly from HTML tags of a specific HTML file on a web server. Try see it in a debugger. Look for any associated strings, cross-references of these and where are these used and located in the client's memory. Also, it would make more sense to be transmitted by the GameServer through a packet (I think of too much data in case of an image) or loaded from a specific .bmd file.
On private server files, the loading can happen as the developer wants. (Server side through packet, loaded from a REST API, loaded in a mini-browser, etc). IGCN can load these from server side, while other server files can load them directly from a website, and so on.
It's not necessarily a web browser, as the MU client engine can have window scroll bar.
because S18 have this mini web browser, but in this client what i have someone decide mess up with main.exe