
UPX: The Ultimate Packer for eXecutables
Originally published on my old blog at cumps.be on May 8, 2004.
A tool I used a lot on my .exe files when creating VB6 applications is UPX (which stands for the Ultimate Packer for eXecutables).
This is a very handy tool: you just drag and drop your .exe files onto it and it’ll compact them (and make it a bit harder for newbies to decompile your program).
Of course there are unpackers for the people who really want to decompile your application, but you can at least enjoy the compression that UPX does. I used it on my last project and it went from 208KB to 77KB.
I used the UPX 1.24 Windows console version.
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