svcpack1.exe  (original filename: setup.exe)

MS Service Pack 1 for Windows 95--includes an update,
system administration tools, additional components,
and drivers for Windows 95.

This is only for Windows 95 version 4.0.950. and will update
the version to 4.0.950a.

http://www.microsoft.com/windows/software/servpak1/sphome.htm