run dos command on file in all subfolder of "test"

I have written a script to capture all files within the folder, but how do I run a program with dos command for only files in the folder and it subfolder?

$files = get-childitem c:\test -recurse

foreach($file in $files){

$filesCounts = $files.Count

if(!$filesCounts)

{

$filesCount = 1

}

$intNumberfiles++

& "C:\program files (x86)\program\program.exe" -password KIVnow C:\test\.\$file

}