It is used by WinAce, a popular archive program. This is a good tool that allows users to save their files in an archive because this program can compress their files either in zip, rar, etc. These .xef files used by this application are usually encrypted files using the said application. Programs such as MacUnace for MAC and E-merge WinAce for Windows can be used to open files with this file extension.

The .xef file extension is also associated with eManager. This program is a very helpful tool when it comes to controlling risks as well as quality especially for offices, businesses and other organizations that require management tasks and incident handling tasks. The major applications that can open these .xef files are WinAce Archiver v2.69, X-Genics eManager, MacUnace, and E-merge WinAce, but a file converter can also be used to open these files without installing the said programs in the system.

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