Is there SNCF office or ticket window at CDG?
 

Does anybody know? Are there offices somewhere in center Paris (not at the stations)?

Yes, there is one at CDG. <BR> <BR>And in Paris, you just have to go to one of the train stations.

Thanks! Do you know where at CDG? Which terminal?

YS: There are two at CDG, both in terminal 2. One is actually right at the TGV station, and the other I don't think I could decribe for you other than to say it's on the bottom floor off in a corridor near the TGV station - just a small window with one person selling tickets.

There is another option when you're in Paris, you can buy the tickets at a travel agent -- they will charge you extra though (50F or so.) <BR> <BR>

I'm sure you can buy train tickets in Terminal 1 also. We always get them there so we don't have to hassle with the big train stations.