The VB runtime is a separate library containing various functions for use in your VB applications. This runtime can be installed (copied) into the Windows directory, where it can be used by every VB application written in the same version (VB5 runtime is not compatible with VB6 runtime).
This allowed the compiled VB applications to be very small, because in this mode large chunks of common code were created.
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, API Windows Win32/Win64.; -)