powershell - Running an exe with dynamic arguments -

i execute command:

dot -tjpg c:\wamp\www\schoolmate\pixy\graphs\xss_index.php_1_min.dot > c:\wamp\www\schoolmate\pixy\graphs\xss_index.php_1_min.jpg  

for files in directory. names of output files should same input file except extension.

something should work (untested):

get-childitem c:\wamp\www\schoolmate\pixy\graphs\*.dot | % {     & dot -tjpg $_ > "$($_.directory)\$($_.basename).jpg" }