i got tales of Ocean Fantasy, The company close doors, i want to extract the .pak file to study it, someone can help me?

i downloaded it from here:
http://games.sina.com.cn/z/hzm/download.shtml

Contents/assets of any game are copyrighted and can't be used for any personal/private/commercial purpose, unless you've got license/permission from the owner to do so, doesn't matter if the company is still operating or not.

the campany is closed, so this game have no copyright

even if closed, it was made by someone, so unless it is stated that their source is non copyright (open source), then it is still under this copyright rule