arpro2.dll is loaded as dynamic link library that runs in the context of Internet Explorer. It is marked as a Safe for Scripting ActiveX control for IE which allows it to execute scripts within the web browser which is allowed becuase the module is digitall signed. It is installed with a couple of know programs including AEGIS Software published by AEGIS Software Corporation, SaralTDS Professional 2016-17 from Relyon Softech Ltd and SaralTDS Professional 2016-17 by Relyon Softech Ltd. The file is digitally signed by Data Dynamics which was issued by the VeriSign certificate authority (CA). This particular version is usually found on Windows 7 Professional (6.1.7600.0).