ARHANGEL
From Just Solve the File Format Problem
ARHANGEL is a compressed archive utility for DOS, and its native .LG file format. It was developed by a person who might be named "Lyapko George", "George Lyapko", or "Lyapko Yuri Georgievich". It was distributed as shareware. Its name is derived from "ARchive HANdler by GEorge Lyapko".
Based on the warnings in the change log, you probably shouldn't expect much compatibility between different versions.
The ARHANGEL author also developed LGHA, an optimized archiver for HA format. The ARHANGEL credits suggest that ARHANGEL may have been inspired by HA.
Identification
Files created by v1.40 start with ASCII "LG".
