It sounds like you may be encountering an issue that was introduced with this recent (10/10/2017) Microsoft update:
https://support.microsoft.com/en-us/help/4041691/windows-10-update-kb4041691
In the Known Issues section...
Installing this update may cause applications based on the Microsoft JET Database Engine (Microsoft Access 2007 and older or non-Microsoft applications) to fail when creating or opening Microsoft Excel .xls files. The error message is, “Unexpected error from external database driver (1). (Microsoft JET Database Engine)".
Download and install the Microsoft Access Database Engine 2010 Redistributable, and then modify the DB connection strings in Microsoft Excel to use ACE as a provider. Example: Change Provider=Microsoft.Jet.OLEDB.4.0 to Provider=Microsoft.ACE.OLEDB.12.0.
Microsoft is working on a resolution and will provide an update in an upcoming release.
(If you wish to confirm this is the issue, turn on EG logging (in Tools->Options->Application Logging), reproduce the problem, then search your EG log for the error message, "Unexpected error from external database driver".)
Microsoft has not provided a resolution at this time. Also, EG users can't make use of the Microsoft suggested workaround (above), since the EG application would have to be changed to implement the workaround. We plan to contact Microsoft regarding this issue.
For now, there are some workarounds in EG (ex. export to another format, such as xlsx, csv; use proc export, etc.).
UPDATE: We contacted Microsoft. They pointed out the blog post below which contains more details, and indicated a fix is forthcoming in their November update:
https://blogs.msdn.microsoft.com/dataaccesstechnologies/2017/10/18/unexpected-error-from-external-database-driver-1-microsoft-jet-database-engine-after-applying-october-security-updates/
Casey
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