How to change imageres.dll.mun icons using regedit?
There are no registry entries for .mun files inside
C:\Windows\SystemResources.
The whole point of migrating icon resource files from being embedded
in DLLs in the protected directory of C:\Windows\System32,
was to make them easily editable by users.
The folder C:\Windows\SystemResources itself is not protected and
you may change any of the contained files, using any icon editor of
your choice.
If the editor refuses to accept files with the .mun extension,
you may need to rename the file (it's better in all cases to copy
it elsewhere while editing).
For example, here is
Greenfish Icon Editor
editing imageres.dll.mun:
