Hmm, easier then I thought. Still, if the user has no idea where the .exe came from, they might not think to try and unzip it. It's certainly some level of protection. I guess it all depends on what the OP wants to do.
Re^3: Encrypt perl script
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The Security through obscurity debate aside, it is a barrier I agree, just not a particularly tough one to overcome. Add to the mix that by default pp doesn't clean up after itself, that is to say that once the executable is run the entire contents us extracted to a temporary area, so that it starts up quicker in future. This would be trivial to find when all modern operating systems allow users to find new files created (within a date or date range).