Depends. If you've got a file association set up with perl scripts (or more correctly put, an extension, such as '.pl'), then a call to perl is not necessary. But in his case, I believe you are correct in a way: I don't think he has a file association set up for the extension he uses for his scripts.

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eval reverse@{[lreP
=>q{ tsuJ\{qq},' rehtonA'
,q{\}rekcaH },' tnirp']}[1+1+
1,1-1,1+1,1*1,(1+1)*(1+1)];
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