I am building a ribbon which can shows a custom tab in a certain workbook.

This is the sample code on the ribbon:

HTML Code: 
This is the vba code of onLoad:

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"MyTab" still shows in the other workbook. How do I make "MyTab" shows in one particular Excel file, for example "Template.xlsx" but not the other workbooks or Excel files? And even better, if another person creates "Template.xlsx" and import this ribbon, "MyTab" won't show up also ( so must be my file instead of created ones ) ?