Wind, gravity, and distance affect your shots.
For the technical user, the difference between a standard ISO rip and the is night and day. Here is what the CODEX release actually does to the game files. Enemy Front PROPER-CODEX
The "PROPER" tag is most felt in performance. The original crack caused high CPU usage because it was stuck in a loop checking for a debugger. CODEX stripped this out. Wind, gravity, and distance affect your shots