I believe you can replaced the *.bmp without compressing it or putting it back in *.zip file such as data.zip (I know it works for Primo and when I did it a while back for NextGen) Also for NextGen, since you only have ability to have only one *.bmp you can only have it in landscape or portrait but not both. That is if you use landscape bmp (ex: 800x480), it will clipped top and bottom when shown in portrait; and if you use portrait bmp (ex: 480x800), it will clipped left and right, when shown in landscape. For iGO/Primo you can have two *.bmp, one for landscape and one for portrait and they will showed correctly.
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