By default this package just loads the standard graphicx package Which can include files with spaces or multiple dots.
The original code, by Heiko Oberdiek, is still available as an option. This extended the original LaTeX graphics code to support spaces and multiple dots in filenames.
If required use
\usepackage{grffile}[=v1]
to use the original version of this package (grffile-2017-06-30.sty).
tex grffile.dtx
will extract grffile.sty and grffile-2017-06-30.sty