What are ADO files ?

ADO stands for Application Data Object and holds the application code for alayer. You have an ADO file for each layer you have modified in your system.Per defaul it is locaed in C:\program files\Microsoft DynamicsAX\40\Application\Standard . There will be at least a axSYS.aod and anaxSYP.aod . Where the axSYS.aod is the SYS layer and axSYP.aod the SYS-Patch(SYP) layer.