I wantes to know with what program I can modify LFS.exe file. I want to ''tweak'''cars and then save it to LFS.exe and then I can make a server with and give exe file to others so they can join to server.
Why don't you just use LFSTweak for that? Seriously, if you were able to do this yourself, you wouldn't be asking us how... I don't know how about the latest updates to cheat protection, but you could make perfectly working LFSTweak server as long as all players use the same settings in LFSTweak.