Never put such files in the System folder.
Then they can work for any program needing these files.
For some DDL files it is known that there are several versions. So, if you have software that needs another version of the DLL-file that program might stop working or behave erratic.
ONLY place them in the folder of the program that really needs them. Same goes for files like VBxxx.DLL files.
You can also try the Eliminate white plugin. It's another one but does the same.