These libraries contain code that is linked into the user's program by SLINK as part of the program's executable image. They are easy to build and need no special initialisation. Win32 standard and import libraries are very similar to UNIX COFF archives and for that reason are referred to as archives. Archives consist of complete object files loaded in together with various headers. These object files are referred to as members. Win32 archives usually have the filename extension .LIB.