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Error opening an Excel file: 'xr2' is an undefined prefix. Line 1 position nnn.

Note: this problem happens with AQT v10, but has been fixed in AQT v11.

This error can happen if you have exported to a file in non-native format, then later exported to it in native format.

The Excel file has been corrupted in a minor way; don't worry - your data is still intact!

To fix this problem: