These are some x-trap server bundles that the client x-trap server checks for right after init.
The Xt client will always check XDataVx.Xtp for files and download the list there, the server path is usually stored in the game .exe encrypted, but you can sniff it out using wireshark or similar tools.
If you do get the path you can edit your host file to redirect to your own webserver and download your own files ( which I posted ) from there. This can be used both on private servers to strengthen your protection (upgrade) or to cheat ( downgrade) as I posted both the newest and oldest xtrap files I could get my hands on.
1. Copy XTrapUpdateXXXX to root of your local web server
2. Rename XTrapUpdateXXXX to XTrapUpdate
3. Edit hosts to 127.0.0.1 "downloadpath"
4. Start the game