How to use document manager API in solution.

Hi,

I am developing the application using the SolidWorks document manager. I have added the path to swdocumentmgr.dll into the Project Properties->C/C++->General->Additional Include Directories. However, when I try to import dll using 

#import "SwDocumentMgr.dll" raw_interfaces_only

then it gives error can not open source file.

Please let me know.

SolidworksApi/macros