Before you start downloading replacements, it is helpful to know why they vanished in the first place.
A: That file belongs to Steam’s DRM. If you own a non-Steam version (Rockstar or Epic), you will not have that DLL, and you should not try to add it. Make sure you launch the game via the correct launcher. Gta 5 All Dll Files Download
Most "missing DLL" errors aren't actually game files, but Windows system files. Before you start downloading replacements, it is helpful