In computing, ACE is a proprietary data compression archive file format developed by Marcel Lemke, and later bought by e-merge GmbH.
e-merge GmbH also produces a Commandline ACE for DOS; and a freeware command-line interface decompression tool for Linux (i386) and macOS called "Unace".
On November 23, 2007, version 2.69 of WinACE was released, including a less-intrusive adware application, MeMedia AdVantage, which replaces WhenU.
Since 2017, there is a BSD licensed python module and CLI utility by Daniel Roethlisberger, that supports unpacking of ACE 2.0 format archives.
Since WinACE support is discontinued, users are advised against opening ACE archives in WinRAR and possibly other products using this library.