Within Suspicious Package, you’ll see three primary tabs which detail all sorts of information about the package file. Once Suspicious Package is installed, you can give it a try by dragging any PKG installer file into the application, or selecting a package installer in the Finder and hitting Command+Spacebar to activate Quick Look on the package in question. Get Suspicious Package free from the developer (for macOS and Mac OS X).

If any of this sounds interesting to you, you’ll want to download and install the application, which includes a Quick Look plugin: pkg files on a Mac is not particularly complicated though it’s obviously most appropriate for advanced users who will have a general idea of what they’re looking at and what to make of it.

Using Suspicious Package to open and inspect. This is where the amusingly named ‘Suspicious Package’ application comes in to play, it’s a free Mac app which allows the opening and inspection of PKG installer files before the installation is actually executed, giving you a look at what is going to happen when the PKG is run.

Open up exe files on mac