ADEX Registry - Version 2.5 ADEX Registry is a COM component that enables application developers of Microsoft technology to access the system registry from their application code. ADEX™ Registry has been developed using Microsoft ATL, providing users fast access to the registry. It provides an intuitive Object Model with a design similar to the system registry's structure, giving users access to any key/value/data they want. If users are not familiar with the registry structure and just want to read/write data from/to it, they may simply call the GetAppData/SetAppData.