Win 7下的ODBC不同bit所在路径名字取得实在令人发晕

C:\Windows\System32\odbcad32.exe是64 bit ODBC

C:\Windows\SysWOW64\odbcad32.exe则为32 bit ODBC

应用通过ODBC连到Oracle数据库的路线图（refer:http://support.microsoft.com/kb/140548）

              ORACLE CONNECTION 6 AND 7 CONNECTION PATHS
              ------------------------------------------

                               Application
                                    |
                      ODBC Driver Manager(ODBC.DLL)
                                    |
                 ORACLE Driver(SQORA.DLL or SQORA7.DLL)
                                    |
                        OCI Layer(ORA7WIN.DLL)
                                    |
                 SQL*Net Driver(like SQLTCP.DLL, SQLTCP1.DLL,
             SQLTNS.DLL, SQLTNS1.DLL, SQLSPX.DLL, or SQLSPX1.DLL)
                                    |
          Network Software(like Microsoft NT Server Client Software, WFW
             Client, Win95 Client, or Novell NetWare Client Software)
                                    |
                             SQL*Net Listener
                                    |
                              ORACLE RDBMS

ODBC Component
* Odbc32.dll - ODBC Driver Manager
* Odbc32gt.dll - ODBC Driver Generic Thunking
* Odbcad32.exe - ODBC Administrator
* Odbcconf.dll - ODBC Driver Configuration Program
* Odbcconf.exe - ODBC Driver Configuration Program
* Odbcconf.rsp - ODBC Driver Configuration File
* Odbccp32.cpl - ODBC Control Panel
* Odbccp32.dll - ODBC Installer
* Odbccr32.dll - ODBC Cursor Library
* Odbccu32.dll - ODBC Cursor Library
* Odbcint.dll - ODBC Resources

Reference:

Windows 7 and ODBC