Site Server Searching Access Databases

Need help to search an Access database with Site Server Search.

Gatherer log shows no filter available or filter failed but the MSKB says

“This IFilter implementation (in offilt.dll) filters files for the documents in Microsoft Office, including the documents for Word, Excel, and PowerPoint. These include files with the extensions .doc, .mdb, .ppt, and .xlt.”

and I am searching other Office docs successfully.