UPX, the Ultimate Packer for eXecutables, is a free and open source executable packer supporting a number of file formats from different operating systems.

Information about UPX executable packer

UPX executable packer is mostly used to open:

System files by 100% of users

UPX executable packer is usually found in following folders:

%ProgramFiles%\Arc\Alpx\UPX307.EXE

UPX executable packer links:

UPX executable packer Website
Download full/freeware version of UPX executable packer

UPX executable packer is reported to open following extensions:

System files

.exe