It can be completely replaced, there is one called imageres.dll.mun in Win10 and Win11 system, different from Win7 and Win8, remove the mun and only leave the .dll is available, imageres.dll.mun has dozens of kilobytes, while imageres.dll is only a few kilobytes, you should be talking about the former, it is located in C:\ Windows\SystemResources
Many files have the same name, I don't know which system you are referring to, just remove the mun at the end, win7/8 needs to be changed, win10/11 can be replaced directly