How to launch the program from PERL script under Windows server?

Example:

#!/usr/bin/perl
print "Content-Type: text/html\n\n";
$ExecString = 'C:\Progra~1\ImageConverter Plus\ICPCL.exe -convertto tiff –source C:\In\ic1.bmp –dest C:\out dither:no -oper Resize size:800 1256 keep_prop:no method: bilinear
exec $ExecString;