If you found this name on a file-sharing site or a music forum (like SoundCloud or Discord), it likely refers to a "Hard" style remix or beat produced by a user with the handle "tdj."
If this refers to a specific (like a .zip archive from a site like "TDJ"), here is how you might proceed:
Could you clarify where you encountered this name or if it’s a you are trying to open?
If "tdj" refers to the electronic artist TDJ , this could be an unofficial "hard" edit or a track from one of her "SPF" collections.