Under Windows (tested with XP), you can create a .cmd file and simply have it run the Perl program with the argument of %1 to pass the filename over, as if executed by commandline.
perl c:est.pl %1
Then you can simply drag and drop a file onto the .cmd file to execute.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…