You can see this problem in the Defold editor too
I’m not sure what’s wrong, but I know I dealt with this kind of problem before in the past. Here is my tools for building icon.res files if that helps. I use https://iconverticons.com/online/ to make good ico files from pngs
icon.zip (545 Bytes)
Maybe custom icon is simply being ignored? The main exe doesn’t show custom icon either after being bundled.
Try using an icon that only contains sizes 128, 48, 32 and 16. I was trying an .ico file with more resolutions, and bob.jar was throwing the following error:
Error - 4 icon(s) not replaced in /var/folders/mm/jk7g3fgx3q18vhcrhl8wq93h0000gn/T/7238089774573629213/x86-win32/dmengine_release.exe using /Applications/Defold/branches/20702/11115/master/resources/win32/app_icon.ico
Nah, now I don’t get an error, but I don’t get the proper icon either…
I looked at the code and it seems as though it requires a .ico file with the following seven images:
* 1. 256x256, 32 bit (RGB / Alpha Channel)
* 2. 48x48, 32 bit (RGB / Alpha Channel)
* 3. 32x32, 32 bit (RGB / Alpha Channel)
* 4. 16x16, 32 bit (RGB / Alpha Channel)
* 5. 48x48, 8 bit (256 colors)
* 6. 32x32, 8 bit (256 colors)
* 7. 16x16, 8 bit (256 colors)
Could you please check your .ico file?
Just tried with this .ico with seven images in the format you specified, and no luck.
Do you have a sample .ico that works that we can study?
app_icon.ico.zip (69.4 KB)
Sorry for bumping this thread, but I’m still interested in solving this. @britzl do you have an .ico that works, so that we can take a guess at what’s happening?
This was actually a bug in the build/bundle-steps, @jakob.pogulis has already merged a fix for this and it will land in the stable on Monday! 
I’m adding the issue id to the topic as well. Thanks for reporting!
Great to know, thank you!