[Question] On version pw1 or pw2?

Who can answer. The server version is distributed in internet, is a modified version 1.2.6 to work with the more urgent by the client. I would like understand is version 1.2.6 PW1 (first version), but not the second (PW2). Previously, I had the original shina documentation from the server (from the developer, which may have been the exact answer to this question) but now it does not, can anyone can share. Or answer this server is a server game PW1 or PW2. THX
(sorry my english)

Like Eistiger said, our server files are 50% PW1 (1.2.4) and 50% PW2 (1.2.6) if I understood right.

As far as I understand from PW2, we use only the *.data files

Some *.conf files was also modified for PW2...