file-spec

    When the /SHAREABLE qualifier is used to create a shareable
    image, this parameter specifies the name you want the linker
    to assign to the shareable image being created. If you do not
    include a file specification, the linker assigns the shareable
    image the name of the file to which the /SHAREABLE qualifier is
    appended in the LINK command line. If the /SHAREABLE qualifier is
    not appended to an input file specification, the linker assigns
    to the shareable image the name of the first input file specified
    on the command line using the extension .EXE.

    If you designate a file name but omit the file type, the linker
    assigns the shareable image the file type .EXE.

 shareable-image-file-name

    Specifies the name of a shareable image. Note that you can use
    the /SHAREABLE qualifier to identify a shareable image only in a
    linker options file. It is illegal to include a shareable image
    in a link operation by specifying it on the LINK command line.