• In the Cross platform section you can choose icon files in the PNG image format (extension *.png) in various sizes. It is recommend to add at least the formats 16x16, 32x32, 48x48 and 128x128. On Microsoft Windows and macOS, the generated executable will have an icon with these images, on other platforms, these image files will be used for desktop integration. It is recommended to use 32-bit images with an alpha channel, 8 bit-palette images will be generated where required. Generated Windows icons contain traditional 256 color images and 32-bit images with an alpha channel. However, it is also possible to use 8 bit-palette images with a transparency color for the input image files.
• If you have an external icon file for Microsoft Windows, you can select the Use ICO file option in the Windows section and choose an icon file (extension *.ico) in the text field below. With the Generate from PNG files option, the icon will be generated as described in the Cross platform section.
• If you have an external icon file for macOS, you can select the Use ICNS file in the macOS section and choose a macOS icon file (extension *.icns) in the text field below. With the Generate from PNG files option, the icon will be generated as described in the Cross platform section. macOS icons can be generated on macOS with the Icon Composer application located in /Developer/Applications. Other possibilities are the free IMG2ICNS and png2icns applications.

Note: If the project has already been saved, relative file paths will be interpreted as relative to the project file.