ACE (file format)
In computing, ACE is a proprietary data compression archive file format developed by Marcel Lemke, and later bought by e-merge GmbH. ACE offers superior compression compared to the ZIP file format, at the cost of a lower compression speed. The file extension is .ace. The MIME-Type is application/x-ace-compressed. WinAce, maintained by e-merge GmbH, is used to decompress and manipulate ACE files under Microsoft Windows. When installed, it lets the user choose between paying for a registration or installing WhenU spyware. Older versions of an extract-only program called "UNACE" were free and licensed under an open source license, but they cannot extract ACE archives from version 2.0 and newer. Besides that, there are some freeware or nagware archivers which can read the format using the official "free" UNACE-DLL, though none are free software as defined by FSF.
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