I think you are referring to reserved error -1001 which I had reported and was fixed in version 2311
This article discusses the unhelpful reserved error messages that you may occasionally see. The meaning is explained for several of these errors together with action you can take to help eliminate these in the future.
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There may be other such examples
As for use cases, perhaps it was useful back in the far distant days of Access Data Projects (ADP) which allowed direct connection to SQL Server but were deprecated in A2007