What your code is doing now is opening the other perl file and giving you a file handle, $fh, to do something with the contents of the file, such as read it. I think what you want to do is not read the file, but execute the file. To do that, you need to execute the file, either through a system call or a backtick call, i.e.

system( 'perl C:/User/MyUser/Desktop/CRA.pl' );

or

`perl C:/User/MyUser/Desktop/CRA.pl`;
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This will run the other perl file in another process.