LoL - the .sav files are located in the save folder of R:TW. Its pretty easy to find it and copy (don't cut&paste) the file. To import a file, you download the zipped .sav file from the link that'll be put on the forum thread and then unzip it and copy&paste it into the main save folder.

I can put up a fuller instruction later when I'm on my main PC (this one doesnt have any TW games on it for example purposes)