This program is an unofficial Windows GUI shell for UPX (Ultimate Packer for Executables). UPX is used to compress executable files such as .exe .dll .sys and others. UPX is rated #1 in the ACT - EXE Packer Compression Test. But unfortunately UPX is a console application and though the official GUI frontends are being developed now, until then you can use this Shell. The Shell and UPX are freeware. The Shell does not require the UPX to be installed in your system, however if you put newer version of UPX.EXE in the Shell directory it will be used instead of internal file.
[Download UPX Shell]