choose another icon inside exe when changeing default app for a file type

Question

when open the dialog using "open with...", we can check "always use this app to open .xxx files"
So this exe will be the default app for a file type.

The problem is that the first icon inside the exe will be used as the icon for the file type.

I have several icons inside the exe, how can I tell "open with..." to use my second icon as the icon for the file type?

BTW:
I can change the registry manually to add defaultIcon to specify the icon :
defaultIcon
default, path/test.exe, 1

Is there any other way?

Answer 1

According to How to Assign a Custom Icon to a File Type, It‘s the right way to assign a custom icon to a file type. You can set the HKEY_CLASSES_ROOT\YourProgID\DefaultIcon\(Default) key to specify an application icon assignment.