Since we can't post on the Tips forum, I'll leave this here...
Fully featured wrappers are available for both Mathcad 15 and Mathcad Prime as Add-in DLLs. Documentation can be found at http:/www.coolprop.org. Instructions for downloading the Add-in wrappers from SourceForge for either version of Mathcad can be found here. A Mathcad worksheet is included with the DLL that demonstrates how to use the add-in.
Not true. I spent the last year coding IF97 into it. You just use the fluid "IF97::Water" instead of "Water". This calls the IAPWS-IF97 backend, which is now included. See the docs.
The Mathcad add-in was re-implemented in version 6.0.0 and full IF97 was implemented in 6.2.0.
Again, please read the documentation. Just use the fluid "IF97::Water" instead of just "Water" or "HEOS::Water"; the HEOS implementation is IAPWS-95. There's no reason this won't work in the Maple wrapper as well. It's been tested in Python, Mathcad, and Excel wrappers. You might have to download the latest version of CoolProp if Maple is distributing an older version. Version 6.3.0 is hot off the press, so I doubt they have it yet in their distribution.
I see that the latest Maple 2018 release only includes CoolProp 6.1.0. I believe that IF97 is only partially implemented in that release of CoolProp. That was about when I started working on it.