indexsym.cmd -l:Lang -n:Build_Num -x:Plat [-i:Symbol_Info]

  -l:Lang             language
  -n:Build_Num        build number
  -x:Plat             build arch and build type
  -i:Symbol_Info      the symbol information; default is tools\sp\symbolinfo.txt

Eg.,
  indexsym.cmd -l usa -n 1045 -x x86fre