I believe some care is needed if you are relying on the is_ms_shipped flag being set to 1 for all MS shipped procedures. I get a list of stored procedures which I think are diagramming procedures that are not user defined procedures.

For example:

sp_alterdiagram

sp_creatediagram

sp_dropdiagram

sp_helpdiagramdefinition

sp_helpdiagrams

sp_renamediagram

sp_upgraddiagrams

There may be more.

cheers

Tony