Following up on the suggestion by LanX in 11129674 to search for the error, this old bug report comes up as looking relevant: https://rt.cpan.org/Public/Bug/Display.html?id=4633.

What versions of PAR::Packer and Archive::Zip are you using?

Also, are you able to provide code to replicate the issue? For example: What code are you packing? What is the pp command you are running? Are you packing files with special characters in the name?

And can you open the zip file using some other utility such as 7zip?

In reply to Re: get "format error: bad signature" when using an .exe created by a "pp" by swl
in thread get "format error: bad signature" when using an .exe created by a "pp" by levW

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