If you use 7-Zip you are probably well aware that it can open just about any compression format out there. As such, just about any file extension you can think of that has to do with compression is just a double click from being opened. However, did you know that you can open many “non-zip” files?
For example, if you try to open an MSI installer file in 7-Zip, you can. Just right-click on the file and go to the 7-Zip menu and select Open Archive. If you do open an MSI file you will see a large list of files which make up the installer. These files are essentially unreadable to the end user, but they give you insight into what makes up the file.
An MSI file is a bad example, but the point is pretty much any file format which uses compression can be opened in 7-Zip. So give it a try sometime if you are just fooling around.

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