What is .YDK file?
Yu-Gi-Oh! deck file used by YGOPRO, a Yu-Gi-Oh! dueling game that allows you to play on or offline; contains a deck of virtual playing cards; includes life points, counters, and card effects.
The YDK deck file contains Monster, Spell, and Trap cards that can be loaded into YGOPRO and used to duel other players. Each card has different information such as the level, attack, and defense.
Recommended Software Programs to open .YDK file