No no no no no. You're getting confuse bewteen XWIS, XCC Mixer, Mixes, and.. everything really.
XWIS is a CONNECTION TOOL used to connect to the XWIS/WOL server. It is here:
http://strike-team.net/nuke/html/mod...download&cid=1
You said you searched Google and didn't find it. It's the second result when I searched for it. How you couldn't find that I'll never know...
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COMPLETELY SEPERATE now... is the XCC Utilities. These are for extracting game files for editing (MOD MAKING). There is a tool in the XCC Utilities called XCC Mod Creator/Launcher. You can use that to make .exe files for a mod, which means you don't have to mess around with placing .mix files inside the RA2 folder whenever you want to play a mod.
Now, are you trying to play a mod online that you made? Or is it someone else's mod?