Here's a piece of information from the manual. 
The C1 Manual wrote:
Remove Object:
Remove the selected object from Albia. If there is a * next to the name in
the main list, the object cannot be automatically removed using this button.
(...)
A Note on Removing Objects:
The Object Injector supports the .RCB COB file removal system. RCBs are “Remove COB” files. They share the same filename as the COB, but are .RCB rather than .COB. A RCB file is a special COB that removes that object from Albia. Some older COBs are unlikely to come with RCBs. In these cases, follow any instructions that came with the object ir contact the authors directly.