Interesting. So what you'd need to do I guess is just identify the path of the exe, then edit the 'desktop.ini.'
Edit to idea/request:
As I look through my subfolders, I see that some of the applications have secondary exe files in with the main application. Often those have different icons. As such, the "first" exe found is not always the correct one. Perhaps the solution to this, would be to find the exe that has the same name as the folder. Unfortunately, the exe's name is often slightly different.
Maybe it would make sense to navagate to the correct exe, then select it and activate the tool (via hotkey I guess). The tool would then get the path to that exe, then edit the parent folder's desktop.ini folder...
EDIT: On a related, but different topic: About 10 years ago, a fellow named Kilmatead, made a tool in AutoIt for customizing folder icons. It is here
https://forum.zabkat.com/viewtopic.php?f=22&t=8816I just checked and the download still works. And the app works on my current Win 10 laptop.
Lots of options. Sadly Kilmatead disappeared from the forums years ago and is assumed, either dead, or abducted by aliens.