I`ve tried every fix I could find online, but I can`t make this game work...

When asking for technical help giving information will improve your chances of getting help. Information such as exact error messages, system information, game version, preferably even driver versions.

This occurs when launching game directly from xrengine.exe in \bin, or from a shortcut made directly to that. To fix, launch from the gog shortcut found in the main directory, or create a shortcut to the desktop of that gog shortcut. I hope that works!

here the solution.

STEPS:
Go to "fsgame.ltx" and open the file with Notepad.
you immediately notice the repeated lines in the file, read as follows:
"$ App_data_root $ = true | false | C: \ Users \ JAIR2 ~ 1 \ DOCUME ~ 1 \ Stalke ~ 1 \
$ Arch_dir $ = false | false | $ Fs_root $
$ Game_arch_mp $ = false | false | $ Fs_root $ | mp \
$ Arch_dir_levels $ = false | false | $ Fs_root $ | levels \
$ Arch_dir_resources $ = false | false | $ Fs_root $ | You resources \
$ Arch_dir_localization $ = false | false | $ Fs_root $ | localization \
$ Arch_dir_patches $ = false | true | $ Fs_root $ | patches \
$ Game_data $ = false | true | $ Fs_root $ | gamedata \
$ Game_ai $ = true | false | $ Game_data $ | ai\
$ Game_spawn $ = true | false | $ Game_data $ | spawns \
$ Game_levels $ = true | false | $ Game_data $ | levels \
$ Game_meshes $ = true | true | $ Game_data $ | meshes \ | * .ogf; * OMF |. Game Object files
$ Game_anims $ = true | true | $ Game_data $ | anims \ | * .anm; * Even more |. Animation files
$ Game_dm $ = true | true | $ Game_data $ | meshes \ | * .dm | Detail Model files
$ Game_shaders $ = true | true | $ Game_data $ | shaders \
$ Game_sounds $ = true | true | $ Game_data $ | sounds \
$ Game_textures $ = true | true | $ Game_data $ | textures \
$ Game_config $ = true | false | $ Game_data $ | configs \
$ Game_weathers $ = true | false | $ Game_config $ | environment \ weathers
$ Game weather effects $ = true | false | $ Game_config $ | environment \ weather_effects
$ Textures $ = true | true | $ Game_data $ | textures \
$ Level $ = false | false | $ Game_levels $
$ Game_scripts $ = true | false | $ Game_data $ | \ Scripts | * .script | Game script files
$ Logs $ = true | false | $ App_data_root $ | logs \
$ Screenshots $ = true | false | $ App_data_root $ | screenshots \
$ Game_saves $ = true | false | $ App_data_root $ | SavedGames \
$ Downloads $ = false | false | $ App_data_root $ "
Which will be repeated several times, all you have to do is delete repeated lines.



from this thread: https://www.gog.com/forum/stalker_series/fsgameltx_is_corrupted