Description:

UPX is an advanced executable file compressor. UPX will typically
reduce the file size of programs and DLLs by around 50%, thus
reducing disk space, network load times, download times and other
distribution and storage costs.

Programs and libraries compressed by UPX are completely self-contained
and run exactly as before, with no runtime or memory penalty for most
of the supported formats.

UPX supports a number of different executable formats, including
Win95/98/ME/NT/2000 programs and DLLs, DOS programs, and Linux executables.

UPX is rated number one in the well known Archive Comparison Test. Visit
http://web.act.by.net/~act/act-exepack.html