Your PATH and @INC are irrelevant. open relies only on the path information you pass to it. However, since you're using PerlApp, you need to use a utility function to extract the file from the EXE. Something like this:
my $filename = PerlApp::extract_bound_file($datafile);
open my $fh, ">$filename";
I'm not sure why you're writing to the file, though, because it's really only a temporary file. You may want to rethink that. Files bundled into the EXE are designed for reading - changes you make won't end up back in the EXE. Instead, the temporary file will be changed.
There's more information here.
Are you sure it was a book? Are you sure it wasn't.....nothing?
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