How do I undo a change of the PDF icon provided by Microsoft Edge?

Question

I've messed up my Windows 10 file associations regarding PDF file icons, and I can't undo it because I can't find the original icons.

Please give me a copy of the default Microsoft Edge PDF icon, or tell me their location. I would especially like to know about the old icons.

Answer 1

I found the old PDF icons here:

C:\Windows.old\WINDOWS\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\Assets\

Note that this is under C:\Windows.old\, which holds the Windows directory from before the last Windows version upgrade, and which is automatically deleted by Disk Cleanup after 30 days. Make sure to copy the icons to a folder you control.