for menu stuff it can massively increase iro size but will compress back down with 7zip for distribution.
Thanks for this excellent tool satsuki.
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It seems on ninostyle model pack from nexusmods, this converts the preview images, I did see a log showing mipmap failures, and in the log it mentionedit though they were unused, but they are used, in the png iro they show up in configure box, on the dds iro they missing.