Ddj extension is related to Silkroad game files. You can try to open ddj files with DDJ viewer.
Silkroad stands for a multiplayer game. These kind of games called MMORPG (Massively Multiplayer Online RPG). Silkroad is one of the oldest game in this area. Ddj is part of this game and it is a program file. You have chance to open ddj files with DDJ Viewer program.
What to use ddj
which page related to ddj file
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