Right, so, some people are having problems launching AHD, as an IT tech by trade I tend to have every bit of software installed that other software might depend on to run so some issues I just don't see as a result. This checklist is so you can ensure you can run AHD first time without issue.
1. Open fsgame.ltx and change the gamedata line to true | true
2. Install OpenAL32
3. Install Visual C++ 2010 Redist 32 & 64bit at minimum
4. This shouldn't be necessary with the version of OGSR AHD uses but in some cases it might be, create a shortcut to xrEngine, right-click on it and select "properties". In the Target field at the end leave a space outside of the quote marks and add -steam.
With these things covered you should be able to run AHD without any issues.
Note that AHD is localised for ENGLISH, if you installed Stalker in a different language you will need to change your Stalker installation localisation.
Quick example on how to do this;
Gamedata>Config
Open "localization.ltx" with notepad, change language = eng to language = rus (for russian installations)
Next, go to; Gamedata>Config>Text
Change the "Eng" folder to "Rus" (for Russian installations)
As far as the game is now concerned the files contained within are the russian versions.
