How to open encrypted .dat resources of an online game?

Question

Game development

Actually there is an old online game. Game assets are in .dat format which cannot be opened. How can these files be opened? A small example file. https://drive.google.com/file/d/1wJ43DITD__qRfQHWY...

Answer 1

Judging by the fact that the first 14 bytes of the file occur 243 times in the future, the encryption algorithm is either a banal XOR or RC4.