[kapteeni]

I have HSFX 4.1 and when prompted to replace the old exe with the new one, I see that they are both the same?

Back up the original .exe by renaming it!
kap

OK I think my words were a little too simple.

Winblows tells me they are the SAME in that they were both created and edited on the same dates and times.

No they aint. Test it and you see the difference...
I'm no way computer specialist, but the maker of this mod added some virtual memory or buffer memory to game. maybe some comp geek can lighten us here.
kap