TWB extension files are associated with Tableau Work Book, the files contains graphical representation in the form of tables, dashboard and stories. 

Silky Terrier Dog Breed Playing Aro... Silky Terrier Dog Breed Playing Around
In this article, we discuss about different methods through which we can open a tableau file.  Silky Terrier Dog Breed Playing Around

Method#1 

Tableau workbook can be opened on 

1. Excel 
2. Tableau software.