WinRAR works just the same as WinACE.
About the patches, you take the patch-103.exe & the start-mp-103.exe and put them in to <jk2 game dir>\GameData.
Only after your version is 103 of course! Then double click the patch-103.exe and that'll make SP JK2 NOCD. Now, make a shortcut to start-mp-103.exe and put it wherever may be convienant... cuz that's what you have to use to start a MP game. I suggest you get a .nfo reader.. or open any .nfo files with notepad.
http://www2.vo.lu/homepages/eric.fra...der%20v2.2.exe
Eh.. that one will work =P
Sometimes though, you'll get an error while playing MP w/ NOCD. If that error bugs you, and you have some free time/space... Create an image of your cd onto your HD and mount it using
Daemon Tools. You'll run into no errors that way.. cuz the game has 0 protection.
G'luck.