/sys$common/syshlp/helplib.hlb RUN, Process, Parameter  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 filespec

    Specifies the file name of an executable image to be executed in
    a separate process. The default file type is .EXE. The asterisk
    (*)  and the percent sign (%) wildcard characters are not allowed
    in the file specification.