Is #defaultconfig a literal file name? Or are you using it as a placeholder in your post?

In any case, storing files within the packed executable (zip file) is done using the --addfile switch. Details are in the documentation: pp

Files packed in this way are located in the inc directory under $ENV{PAR_TEMP} when unpacked, and your script can look for it there.

Some example code to handle both packed and not packed scripts is below.

    #  get the default config file 
    if ($ENV{PAR_0}) {  #  we are running under PAR
        my $path = Path::Class::file ($ENV{PAR_TEMP}, 'inc', '');
        my $path_str = $ui_path->stringify;
        ...
    }
    else {
        ...
    }
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