You have to be more precise, which icons and which Nextgen.
The "classics" Nextgen have the icons in the menus in the vector format .svg, on the route they are in the format bmp x iGO, (they are all in the file speedcam.zip), and the POIs can be in either the bmp or bmp x igo format. The same is true for the skin file as well.
In LUNA, on the other hand, almost everything is in vector format, only for your POIs you can still use images in the bmp or bmp x iGO format.
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