Referencing SQLDMO in UNSAFE assembly

I created a SQL Server Project in VS 2005, and tried to add a reference to SQLDMO Object dll. But the reference --> add reference, does not allow it. It does not work, even if I set the Assembly Permission Level to UNAFE/EXTERNAL ACCESS.

Reason I'm trying to do this:

We have a SQL 2000 stored procedure that uses SQLDMO using sp_OACreate to BCP files to database. We are converting to 2005 and because of SOX restrictions, I'm trying to replace the sp_OACreate part with external stored procedure written in C#.

According to BOL, I thought atleast UNSAFE should support this, but it seems not.

Probably, I'm expecting too much..

Your help is greatly appreciated.

Thanks

Thanks to Vineet Rao's posting to one of of the answers on this forum, to a similar problem.

I registered "signed" InterOp.SQLDMO.dll (which is obtained by referecing to a regular project) , as UNSAFE, and it appeared in the Reference section of SQL Server Project.

Thanks

Baskar