I used these all the time when rolling out Windows 3.1 and 3.11 for thousands of computers back in the early 90's.
You would just pick any icon that seemed relevant, with a focus on not choosing the same icon for two different applications.
Computer GUI's were so new then that people didn't really care if the icon was 100% correct or not.
Sometimes for big applications I would draw up an icon and then use it, but mainly try to stay on moricons.dll or any dll's that came with the application that might contain icons.
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