Why my vbs script can not add to the MSCS?

Few days ago I got a trouble when adding Generic Script to MSCS.
Finally i found the solution…

For add to Cluster, Script implement the Generic Script resource DLL entry points.
This is MSDN document about that.
http://msdn.microsoft.com/en-us/library/aa373089(VS.85).aspx

Normal Script doesn’t added on MSCS…^^
Only Script that are implemented the Generic Script resource DLL entry points, can added.