UPX, the Ultimate Packer for eXecutables, is a free and open source executable packer supporting a number of file formats from different operating systems.
Read more about UPX from Official Site: http://upx.sourceforge.net/#download
Read about executable compression: http://en.wikipedia.org/wiki/Executable_compression
At DelphiBasics, we pack all our executables with UPX to minimize the storage required for our resources.
To pack an executable with UPX, just drag it onto the UPX program in Windows Explorer. :)
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