Newer games want new functions in Direct X, and MS makes them and give it to everyone.
The previous update (DX9c April 2006) seemed to help some users in reguards to issues with the 3d sound in GuildWars including performance issues.
I've always did the updates and so far have not had any issues created by updating myself.
All update are accumlative too, so getting the new one give you all the previous updates.
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