Hi Yakov.
Of course this isn't mentioned in release notes and available documentation for pb 12.6. But during the beta for pb 15 (which you know has been renamed to 12.6) it was clearly stated in the accompanying document:
Using 64-bit Database driver
OLE DB and DIR database interfaces are not supported in 64-bit platforms; all other types of drivers are supported.
As I understand this remained like that until final release. And those who read this document were not expecting to see OLE DB support in final release.
Andreas.