This has almost the status of a FAQ, albeit concerning various different tools. The following nodes found using Super Search with "executable script extract" in SoPW may serve as a starting point: Extract a script from a perl2exe executable? and Decompile PerlApp.

Further searching will likely turn up mode nodes that may help.

DWIM is Perl's answer to Gödel

In reply to Re: Get a script out of executable back by GrandFather
in thread Get a script out of executable back by TheMarty

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