Use your OS smile Here's an NT solution, I don't know 9x syntax for this. ;p
Code:
alias renall {
  if !$isdir($2-) { echo -a * /renall <string> <path> | return }
  var %a = $1,%b
  .fopen -no renall renall.cmd
  if !$ferr { %b = $findfile($2,$+(*,%a,*),0,renal $+(%a,;,$1-)) }
  .fclose renall
  if $file(renall.cmd) { run -n renall.cmd | echo -a * Renaming %b files. }
  .timerrenall 1 5 .remove renall.cmd
}
alias -l renal { 
  tokenize 59 $1-
  .fwrite -n renall rename $+(",$2," ",$remove($nopath($2),$1),")  
}


Example: /renall -abc X:\path\to\files