bjgamer: Ah. I had thought if they had given a reason or even a response then there might be a chance to work it around. Oh well. Thanks for the answer anyway.
Gede: I thought “what the hell…” and sent an email Triumph Studios. They had this to say:
Gede: Which is pure bollocks, his "standardized dll's" comment refers to the Steam-Runtime which can be used outside of Steam, including non-Steam games. From a library of over 350 games this remains the only one where I don't own all the DLC's and Expansions.
The Steam-Runtime is a collection of libraries (.so files), most of them based on Ubuntu 12.04. It serves as a distro-agnostic solution for Valve / Steam games.
For the record: Grim Fandango Remastered packs a whopping 366MB of Steam-Runtime libraries in the GOG version (not GOG's decision believe me), ironically being a 32bit only game the devs even included the 64bit libs, 180mb right there wasting space and bandwidth.