InDesign v20.3 shows blank square in Windows File Explorer, instead of INDD Icon. Opens as expected in InDesign 2025.

I have already done icon cache rebuild, repair install, and reset file associations.

BTW The reason why it's important: InDesign icon isn't just cosmetic. It’s a visual anchor that helps you quickly pick .indd files out from folders full of images, PDFs, and links. Losing that icon seriously hurts workflow — especially in design-heavy environments with lots of asset types.