When SAP first introduced 64 bit compilation capability they didn't provide a driver for OLEDB for 64 bit:

https://archive.sap.com/discussions/thread/3775672

I'm looking at the runtimes provided in the Program Files (x86)/Appeon/Shared/PowerBuilder/x64 by Appeon and I don't see one there either. What we're missing is a 64 bit version of PBOLE170.DLL.  I'd recommend reporting it to Appeon as a bug.

I have run into this issue as well.  Has there been any progress with this in the last year?

If you want to use SNC SQL Native Client (OLE DB), please install Microsoft SQL Server 2012 Native Client.  Please select Download at https://www.microsoft.com/en-us/download/details.aspx?id=50402), and then select to install ENU\x64\sqlncli.msi. 

Best regards... Julie