c++ - Microsoft IDL, Change attributes on an interface -

some time ago prepared idl file define interface plugins of vb6 application.

reviewing code found there interface looks this:

[     odl,     uuid(<some guid>),     version(1.0),     nonextensible, oleautomation ] interface iplugin : iunknown {     hresult dosomething(); } 

this interface used in vb6 , c++ components (dlls) expose main plugin class, exe refers typelibrary keep reference of plugin classes.

what remove odl, version , nonextensible because not required, , add object attribute correctly define com interface.

• now entire system in production, can change attributes on interface?
• can without compatibility issues?

thank you