Windows systems such as Windows Vista and Windows 7 or above can support the display of large icons, but programs compiled by Delphi can only display 32x32 icons, which makes the programs compiled by Delphi look very unprofessional. Let me share the method of compiling large icon programs in Delphi.
To use large icon compilation, you must first prepare a 256x256 icon image.
Use icon editing software, such as IconWorkshop, to open your ico file, create a new 256x256 true-color icon, and import your image file into the icon. After saving the icon, copy the icon file to your project directory, assuming it is mainico.ico, then create a mainico.rc file under your project and enter the text in it:
MAINICON ICON mainico.ico
Open the command line window, switch the directory to your project directory, enter the command rc mainico.rc, and press Enter to execute. At this time, a mainico.RES file will be generated in your project directory.
Open your project in Delphi, select the menu Project->View Source, add a line {$R Mainico.RES} below {$R *.res}, and then compile the program.
The Windows system caches icons, so you may not see the effect just after compilation. You can copy the compiled program to another place to see if it becomes a large icon.
The rc command calls Microsoft Windows Resource Compiler