IT WORKED! I am so happy! Thank you and thanks to everyone who were so kind to help me! I didn't know %PATH% wanted only folders! I removed the perl.exe ending and when I ran perl -v in the CMD I got this:

Copyright 1987-2012, Larry Wall

Perl may be copied only under the terms of either the Artistic License
+ or the
GNU General Public License, which may be found in the Perl 5 source ki
+t.

Complete documentation for Perl, including FAQ lists, should be found 
+on
this system using "man perl" or "perldoc perl".  If you have access to
+ the
Internet, point your browser at http://www.perl.org/, the Perl Home Pa
+ge.
[download]

Then I ran this command  perl test.pl And it output "Hello World" rather than opening the file! Thank you soo much everyone!