Where are the .dds files for icons in the base game stored?

[Mettpawwz]

Anyone know where they are? I'd like to be able to browse through all of the existing icons in order to choose the ones I want for my custom buildings.

Thanks in advance.

 

[Infixo]

In .blp files. Can't browse them. But there's no need for that - they are in game assets, download from steam tools.