still works for the latest patch, will work for the next coming patches too.
All you need is a Hex Editor (any editor will do that, search for some freeware in the net)
Then copy your original Conquer.exe (as a backup!) in another folder.
After the backup is done, do the following :
1. open Conquer.exe with the hex-editor
2. go to "search"
3. put 45 6E 67 6C 69 73 68 in the hex search field (not the "text" search field! )
4. change "English" to "english" (small letter instead of a capital "E")
5. save it
6. you got your multiclient
7. and last but not least : be happy ;-)