The .user file extension is most commonly associated with the Visual Studio software application. Visual Studio is used to develop software applications for the Internet and for Microsoft Windows. The USER files contain the user preferences and are used to load and save project preferences for a specific program user.
The .user file extension is also used by the Linux operating system.
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If you have additional information about the USER file format or software that uses files with the USER suffix, please do get in touch - we would love hearing from you.