Is the SAP RFC SDK (wdtfuncs.ocx, wdtlog.ocx respectively Interop.SAPFunctionsOCX.dll, Interop.SAPLogonCtrl.dll) an acceptable / recommended way to connect (Microsoft) applications via RFCs with SAP ? Will there be a support and maintenance of the SDK in the future (especially in ECC 6.0) ? Are there people who use these controls in .NET applications ?
I have good news for you. SAP plans to release a new version of the SAP.NET Connector. See http://wiki.sdn.sap.com/wiki/display/ABAPConn/ABAP+Connectivity+Home