I saw Skybird's original post, and had typed a reply, but I went to resize my browser window, and instead closed it... I wasn't in a mood to retype it at that point...
Code injection can be useful... (Although I think these only do it in RAM.)
Fallout Script Extender (FOSE), and New Vegas Script Extender (NVSE)...
I use these when I run FO3 and FO:NV. Many of the mods made for these two games would NOT work without code injection.
I've seen many similar "patches" (actually a program that launches the games .exe itself) for games that warn that virus and malware scanners may report them as a virus...
So I don't know why those sites would say that AV software
can't find it, when some people have posted on the various download sites that their AV software
IS finding it.
Just a few thoughts.
Barracuda
EDIT: "Code Injection" may not be the correct term for what I'm thinking of...