We are unaware of the fact that .adp (Access Data Projects) files are no longer supported in MS Access database version 2010/2013/2016. These files are used with Access and can of course opened with programs too but only if you are running an older version of the Access database like 2002/2002/2003/2007. However, to work such files in a newer version you will have to convert Access ADP to ACCDB file. In this blog, I will cover .adp to .accdb conversion process to make your old file openable smoothly.