Server Rename Key File name and location

I'm performing a server rename, I'd received the activation code from IBM by e-mail.
But it came as pure text. I tried to save it on a file called mappings.key and move it to /server and /server/conf directory but repotools reports an error that the key file was not found.
So, what is the name and location of Server Rename Key File?
Accepted answer

As far as I can remember you just copy the file ImportURLMappings.activate into the server folder. If you run the commands that require the key, does it say, where it does want it?
2 other answers

I just added the file name and location of the key file to some of the help topics on server rename.