How to avoid copying big files to system / folders spoofing

Hi guys

i have an app that relies on a huge dll (60mb) located in the "common files" folder.
I know how to create an Nsis launcher which copies this dll, but its not really an option with such big file size.
Is there an Nsis command for the launcher, that would fool the exe into thinking the dll is in the expected common folder, while being somewhere else ?

Thank you