Since this thread is in general trainz I don't know what version of Trainz you have. You mention Content Manager, but that does not help either because 2004 has Content Manager, 2006 has Content Manager Plus and 2009 has Content Manager V2. However if you have 2004 you cannot make a CDP file of anything that does not have your kuid number, in 2006 and 2009 right click the item in CMP then select 'save to CDP' then specify where it is to be saved, this can be done on most items in 2006 and 2009.