GIMP works fine with mipmaps.. whenever you load a dds you will be asked if you wanna load the mipmaps... but the most simple way is to NOT DO IT.
when saving a picture in dds format just tick the box to automatically save mipmaps and it will work fine in 7.62, theres no need to load them and edit them by hand.
even tho i think the gimp saves more mipmaps than 7.62 actually uses.. since the additional mipmaps are insanely tiny you won't really notice a difference
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