Key points
General information
<path-to-game>\Game\
AutoExec.com
RunScript User.con, NoExistOK FlipMouseYAxis true, 1
HKEY_LOCAL_MACHINE\SOFTWARE
HKEY_CURRENT_USER\Software\Classes\VirtualStore\MACHINE\SOFTWARE\Wow6432Node
~/.steam/steam/userdata/<user-id>/32350/
%PROGRAMFILES%
%PROGRAMFILES(X86)%
%WINDIR%
%LOCALAPPDATA%\VirtualStore\