Workbook can't be opened/loaded successfully

Hello Keiji, 

Thank you for your help. I resolved the issue. 

Cause: The workbook used the Tableau Table Viz Extension, which my Tableau Desktop version doesn't support. The extension adds a <worksheet-extension> manifest and a <referenced-extensions> block to the .twb, and Desktop's schema validation rejects both. 

Solution: 

1. Open the .twb file in VS Code.
2. Delete the <referenced-extensions> block and the <manifest> block containing <worksheet-extension>, including everything inside them (both are near the end of the file).
3. Reopen the workbook in Tableau Desktop.
4. On the affected sheet, set the mark type to Automatic and rebuild it.

Thanks again for your support.