However, in order to change the icon of the executable application file itself, as it is presented on the desktop (i.e. prior to application execution), it is necessary to employ another, platform-dependent technique.
First, create an ICO format bitmap file that contains the icon image. This can be done with e.g. Microsoft Visual C++: Select "File->New...", then select the "File" tab in the dialog that appears, and choose "Icon". (Note that you do not need to load your application into Visual C++; here we are only using its icon editor).
Store the ICO file in the source code directory of your application, say with the name "myappico.ico". Then, create a text file called e.g. "myapp.rc", and let it contain this single line of text:
IDI_ICON1 ICON DISCARDABLE "myappico.ico"
Lastly, assuming you are using tmake to generate your makefiles, add this line to your "myapp.pro" file:
RC_FILE = myapp.rc
Regenerate your makefile and your application. The .exe file will now be represented with your icon in e.g. Explorer.
If you do not use tmake, the necessary steps are: First, run the "rc" program on the .rc file, then link your application with the resulting .res file.
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