Select the textures directory in the directory tree of the Textures (bottom left) section of the Add Resources window.
Double click on the textures directory to make it the current directory.

Now select the particles directory in the directory tree of the Textures (bottom left) section of the Add Resources window.
Double click on the particles directory to make it the current directory.

Select the "Add All" button in the Textures section (bottom left) of the Add Resources window.
This button will make iMagic load all the texture resources in the textures\particles directory.
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