GUiPeX is a name taken from GUI (Graphical User) and UPX.
UPX, a free DOS command-line , is a portable, extendable, high-performance executable packer for several different executable formats. It achieves an excellent compression ratio and offers very fast decompression. Your executables suffer no memory overhead or other drawbacks. Since UPX is a DOS , a simple GUI front-end for use in Windows was needed.
Download Click Here
Download from here UPX you will need upx308w.zip
The UPX web site is here UPX
Please note the original site at www.blueorbsoft.com no longer has GUiPeX on it,
and appears to be taken over by someone else.
So I put it up on here
This is how the blueorbsoft.com use to look like
You can even download software from above waybackmachine site.