Custom UI editor (file contains corrupted data)

[wmbb]

I've created a custom tab with links to macro's in an excel workbook using Custom UI editor.
Everything works well and the custom tab is shown correctly.
Now I want to add a button but the Custom UI Editor gives an error "file contains corrupted data" and the file is closed without showing the ribbon xml data.
So I've no chance to correct the corrupt data.
How can I solve this problem ?
Where can I find the xml-ribbon data within excel or how can I remove this dat to create a new ribbon..?

 

[TonyJollans]

Is your workbook protected?

Enjoy,
Tony

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I'm working (slowly) on my own website

 

[wmbb]

No it isn't...

 

[wmbb]

Found the problem, the file was encrypted.
Problem solved !

Thank you for your support and pointing me in the right direction !