The S.T.A.L.K.E.R mod tool used to extract the files from the .db files.
Place all gamedata files into a folder called old once you have extracted every .db to a folder called gamedata in stalkers main directory like.
C:\program files\THQ\S.T.A.L.K.E.R. - Shadow of Chernobyl\gamedata
This will stop S.T.A.L.K.E.R using the .db files by default.
download the file: stalkertool.zip (mirror 1) | stalkertool.zip (mirror 2)
(to unpack archives use: WinZip,WinAce, WinRar)