I'm trying to read Excel spreadsheets with a 64bit Process. Therefore I use the 64 bit Version of Micorosft Access Database Engine 2010.

The following code

var cs = @"Provider=Microsoft.ACE.OLEDB.12.0;"
         + @"Data Source=C:\test.xls;"
         + @"Extended Properties=""Excel 14.0;""");

con = new OleDbConnection(cs);
con.Open();

throw an Exception:

Could not find installable ISAM

Using google I found a lot of questions about this exception. But they refer to JET and seem not apply to my problem.

Any recommendations?