How 2 open .dat :(

Hi 4chan. Please help me open these darn .dat files.
They have an .xls (excel) file in them... but I don't know how to open this .dat file.

You can get the .dat files here: http://www.megaupload.com/?d=PHJBAT6L
or here: http://files-upload.com/247181/Language.rar.html
they're in a rar.



You're my only hope!

Oh yeah, also - running Sysinternals' STRINGS utility on the decrypted files gives some interesting snippets:

In UIStringTable: Copyright 2006 Gravity Co., Ltd. & Lee Myoungjin. All Rights Reserved.

In BanNick: Jormungand, Heimdall, Nidhogg, Hrungnir, ... (names from Norse mythology)

So it must be this -- http://www.ragnarokonline.com/