转载：EXE和DLL的区别

转载自: http://space.cnblogs.com/question/812/

The distinction between EXE and DLL files is entirely one of semantics. They both use the exact same PE format. The only difference is a single bit that indicates if the file should be treated as an EXE or as a DLL. Even the DLL file extension is artificial. You can have DLLs with entirely different extensions-for instance .OCX controls and Control Panel applets (.CPL files) are DLLs

--摘自An In-Depth Look into the Win32 Portable Executable File Format

就是一个比特位的不同，告诉OS究竟是exe还是dll