The .suo file extension is most commonly associated with Microsoft Visual Studio solution user options files. This software application uses two file types including the .sln and .suo file extension. Files with the .suo extension contain information about the data associated with solutions used by the software and includes customization options that you have made. The SUO files are referenced each time you open the application.
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If you have additional information about the SUO file format or software that uses files with the SUO suffix, please do get in touch - we would love hearing from you.