Retrocomputing Stack Exchange is a question and answer site for vintage-computer hobbyists interested in restoring, preserving, and using the classic computer and gaming systems of yesteryear. It only takes a minute to sign up.
You’ll find the mappings for these icons in SYSTEM\APPS.INF in Windows 3; this is the file which is used by Windows Setup to detect pre-existing DOS applications on the system, and set up icons for them in Program Manager. Look for “moricons.dll” and the index of the icon you’re interested in.
For example the ADOS icon, index 101, corresponds to Access for DOS.
I wrote a short python script that extracted the icons, matched them with entries from APPS.INF and generated an HTML file. Some entries were missing, so I entered them manually, except for the generic MS-DOS icons which I marked as "(no entry)". One icon was blank. You can find my moricons.py script on GitHub.
MOREICONS.DLLbecause that'd be 9 characters, and
MOREICON.DLLis weird because the icons are definitely plural. Perhaps a better contraction (which generally is accomplished by omitting vowels) would've been