Will DesktopIntelligence for XIR2 SDK support BO 6x?

Hi,

I'm developing SDK application to get the report's info like dataproviders, queries, layout info, prompt info etc. I'm using Desktopintelligence SDK for XI-R2 SDK.

My question is can I use the same application for BO 5x/6x reports. Actually I tried to run the application over these BO 6.5 reports. But I'm getting the following error for some reports :

Unable to cast COM object of type 'busobj.Application Class' to interface type 'busobj.IApplication'

and for some other reports, I 'm getting the error as

ObjBOApp.Logon(username,pwd,servername,authentication mode) member is not found. Logon () is to login to the report.

Am I missing any DLL references? or

Should I develop a new application for 6.5 reports?

Kindly help me.