HKLM\SOFTWARE\WOW6432Node\Microsoft\Office\16.0\Access Connectivity Engine
Have you been bitten by the "bitness mismatch" bug? Let us know in the comments below. access database engine 32 bit
If you have ever worked with Excel, PowerShell, or SQL Server Integration Services (SSIS), you have likely encountered a cryptic error message involving "The 'Microsoft.ACE.OLEDB.12.0' provider is not registered" or a warning about a "bitness mismatch." HKLM\SOFTWARE\WOW6432Node\Microsoft\Office\16
April 14, 2026 Category: Tech Support / Data Solutions or SQL Server Integration Services (SSIS)
Thousands of enterprise apps—ERP systems, CRM plugins, legacy VB6 tools—were written assuming a 32-bit provider. These applications hard-code the path to msaceol.dll in the SysWOW64 (32-bit system folder). If you install the 64-bit engine, these apps simply cannot see the driver.