If you are not using 7-zip, you need to install it. It will unzip just about anything, including install shield files, msi files, gzip files, tar files, rpm, deb, iso – over 20 different kinds of files. It will create compatible compressed files, but it also has it’s own 7z format that has a higher compression ratio that zip. It will make encrypted files and self-extracting executables with better encryption that regular zip. Of course it’s open source, mostly LGPL.Example: The other day I needed to install a printer driver on a machine that a customer connects to with remote desktop. HP had the humongous 205 MB download with all the utilities, but all I needed was the driver, so I downloaded the huge basic driver package, which was only 61 MB. It was an executable, so I tried running it and it complained that the USB was not working while looking for the printer. This was a virtual machine and I didn’t need USB. I tried renaming the file to .zip and unzipping it using the Vista built in feature, but it could not read it. So I installed 7-zip and was able to extract all the files and just install the driver. One more happy customer.