I'm not sure I should file this as a bug but since there's no features requests forum...
When you delete an object type <objectname> from a project you receive the warning:
Deleting this object type will remove all actions, conditions and expressions relating to it, as well as all of its instances. Are you sure you want to delete the object type "<objectname>"? Yes/No
However, when you delete a sound or music file you receive no warning at all. All of the conditions and expressions related to it are deleted.
Please consider displaying the same type of warning for sound and music files.
Thank you very much and keep up the good work. We are very happy with C2.