We all have recently faced a new error when starting Dark Messiah Multiplayer
"Unable to load (steam/steamapps/account name/dark messiah multiplayer/bin/filesystem_steam.dll)....
So, I have found the solution:

You have to open the folder steam=>steamapps=>"your account name" or "common"=>dark messiah multiplayer=>runme.exe

Then find "runme.exe"(in the very end of the folder), that runs DM without any error.
You can even add this file to the library, and play though the steam, and this may save all the favorite servers.
See you in game ^^