I bought Stalker: Shadow of Chernobyl on Steam and installed it. When I try to run the game, it keeps telling me that I am missing OpenAL32.dll and xrSound.dll, but those files are present in the bin folder.
You can download the OpenAL Windows installer here: OpenAL
Just run it from PlayOnLinux Configure by selecting the virtual drive on the left side and then clicking the Miscellaneous Tab, then click "Run an .exe in this virtual drive"