FYI 2013DWG file format is the default for AutoCAD 2013-2014-2015-2016-2017, there is no such thing as a 2016dwg file format.
Your file creator needed to use DWGCONVERT command to know files down for you. But in AutoCAD 2016 turn on the variable PROXYGRAPHICS and PROXYSHOW then turn off PROXYNOTICE variable: that's all you need to do there.
HTH
Your file creator needed to use DWGCONVERT command to know files down for you. But in AutoCAD 2016 turn on the variable PROXYGRAPHICS and PROXYSHOW then turn off PROXYNOTICE variable: that's all you need to do there.
HTH