The .tbk file extension is most commonly associated with the SumTotal Systems ToolBook software. This application creates e-learning tools including online quizzes and software simulations. The projects created with this software are given the .tbk file extension.
The .tbk file extension is also used for Memo backup files, The Bat! backup files and Visual FoxPro memo backup files.
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If you have additional information about the TBK file format or software that uses files with the TBK suffix, please do get in touch - we would love hearing from you.