The question is rather vague, since you did not clearly indicate what language you speak, in my .NET domain, .NET executables are pre-run at run time to speed up loading time. The code can be generated for native code through a process known as NGEN, which takes .NET IL code and converts it into a binary process that can be understood by the processor. Typically, NGEN code is stored in the folder "C: \ Windows \ Assembly \ NativeImages_ {version}", where the version represents the version of the .NET Framework. Check out Jeffrey Richter's CodeGuru here about NGEN and where to use it and when to use it. Have a look here at Codeproject about this article on statistics / comparisons with internal binary code, and also herealso Daniel Pistelli.