Thanks to the Discord user Nivorm#5699 for keeping the archives!
It's a graphic mod (by the looks of it) that enhances graphics in Call of Juarez: Bound in Blood.
ReadME is Russian but i'll try to translate as best as I possibly could:
ENB for Call of Juarez Bound In Blood
--list of changes-
*”intensification of the overall sharpness in the game
*"improved color reproduction
-”settings-
* - copy files to the folder with the game there,
where to find files with the extension "exe"
*turn on/off keyboard effects in game¤ application Shift + F12
(by default effects are enabled)