I just updated Universal Extractor to version 1.3.1. This is primarily a bugfix release for version 1.3, focusing on improved 7-zip support, improved "default" checks for unknown .exe files, and Windows 9x compatability. I also made a few other small tweaks and fixes. As usual, full details can be found in the ChangeLog.
Version 1.3.1 can be download from the main Universal Extractor home page.