Resources are used by NSIS installers with the MUI (Modern User Interface) plugin.
These bitmaps are used in the Welcome and Finish pages of your installers. Typically, its dimensions are 164x314, with white color used to blend with the background of the pages.
These bitmaps are used in the all pages of your installers except in Welcome and Finish pages. Typically, its dimensions are 150x57, with white color used to blend with the background of the header.
These bitmaps are used for checkmarks in tree views. Typically, its dimensions are 96x16 (six 16x16 icons for each check states), with magenta used for transparency. The bitmap is in indexed color mode with 16 colors.
Icons are used in as the icon of the installer when viewed in the Windows Explorer and in the upper left corner of the dialog boxes opened by the installer when it is run. Typically, its dimensions are 32x32 and may have an additional icon with dimensions 16x16.
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