3.2.3 Linker Input Files
  You can specify the object modules to be included in an
  executable image in any of the following ways:

  .
        Specify input file specifications for the object modules.

        If no file type is specified, the linker assumes that an
        input file is an object file with the file type .OBJ.
  .
        Specify one or more object module library files.

        You can either specify the name of an object module li-
        brary with the /LIBRARY qualifier, or specify the names
        of object modules contained in an object module library
        with the /INCLUDE qualifier. The uses of object module
        libraries are described in Section 3.2.5.
  .
        Specify an options file.

        An options file can contain additional file specifications
        for the LINK command as well as special linker options.
        You must use the /OPTIONS qualifier to specify an op-
        tions file. For more information about options files, see the
        OpenVMS Linker Utility Manual .

  The linker uses the following default file types for input files: