Uharc is:

A high performance file archiver created by Uwe Herklotz.

FileCompress is:

A free GUI (Graphical User Interface) for UHARC. In other words it represents the simplest way to use the Uharc with all of its options. To these you have to add the features that the FileCompress offers as an user friendly and modern interface, a shell context menu, the possibility to create customizeable SFX (Self-extracting archives), the preview of the files through the creation of file and virtual folder and the support for v0.6 and v0.4 Uharc archives

Softpedia.com has rated FileCompress 2.0 as

In over Softpedia.com has certified that it doesn't contain any form of spyware

If you have any bug reports, comments, advice and ideas you can send e-mail to FileCompress@hotmail.it