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The roll out of Windows Update KB4041681 can cause an issue which prevents third party applications such as Silk Test from opening or reading data from Microsoft Excel .xls files. This known issue is documented by Microsoft in the following article:
As an example in Silk Test Classic you may encounter an error such as “(HY000) [Microsoft][ODBC Excel Driver] External table is not in the expected format” when trying to access an .xls file via an odbc driver.
Whereas in Silk Test Workbench you may find that the .xls Excel spreadsheet no longer appears visible in the Active Data section.
Microsoft are currently aware of this issue and plan to provide an update, in the interim you can work around the issue by implementing the following:
Uninstall the windows update kb4041681
If that is not possible then for Silk Test Classic and/or Silk4J/Silk4NET you can:
For Silk Test Workbench: