I don't know if he would have your specific answer, but
This Walbeehm dude has done alot of research on Windows updates and bug fixes.
The guys I used to work with said that argueably there are 7 versions of Win 95, and 4 versions of Win 98. No flames here, but that can't be too far off when you consider the Y2K updates to command.com, much less all the other files.
Good luck!
viz