diff --git a/src/game_config.cc b/src/game_config.cc
index dde349d..e4f1425 100644
--- a/src/game_config.cc
+++ b/src/game_config.cc
@@ -1,4 +1,5 @@
 #include "game_config.h"
+#include "sfall_config.h"
 
 #include <stdio.h>
 #include <string.h>
@@ -120,15 +121,23 @@ bool gameConfigInit(bool isMapper, int argc, char** argv)
         configSetInt(&gGameConfig, GAME_CONFIG_MAPPER_KEY, GAME_CONFIG_SORT_SCRIPT_LIST_KEY, 0);
     }
 
+    // SFALL: custom config file name.
+    char* configFileName = nullptr;
+    if (configGetString(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_CONFIG_FILE, &configFileName)) {
+        if (configFileName == nullptr || *configFileName == '\0') {
+            configFileName = DEFAULT_GAME_CONFIG_FILE_NAME;
+        }
+    }
+
     // Make `fallout2.cfg` file path.
     char* executable = argv[0];
     char* ch = strrchr(executable, '\\');
     if (ch != NULL) {
         *ch = '\0';
-        snprintf(gGameConfigFilePath, sizeof(gGameConfigFilePath), "%s\\%s", executable, GAME_CONFIG_FILE_NAME);
+        snprintf(gGameConfigFilePath, sizeof(gGameConfigFilePath), "%s\\%s", executable, configFileName);
         *ch = '\\';
     } else {
-        strcpy(gGameConfigFilePath, GAME_CONFIG_FILE_NAME);
+        strcpy(gGameConfigFilePath, configFileName);
     }
 
     // Read contents of `fallout2.cfg` into config. The values from the file
diff --git a/src/game_config.h b/src/game_config.h
index a444762..c3cac93 100644
--- a/src/game_config.h
+++ b/src/game_config.h
@@ -6,7 +6,7 @@
 namespace fallout {
 
 // The file name of the main config file.
-#define GAME_CONFIG_FILE_NAME "fallout2.cfg"
+#define DEFAULT_GAME_CONFIG_FILE_NAME "fallout2.cfg"
 
 #define GAME_CONFIG_SYSTEM_KEY "system"
 #define GAME_CONFIG_PREFERENCES_KEY "preferences"
diff --git a/src/sfall_config.cc b/src/sfall_config.cc
index 4f9d73d..af6a05f 100644
--- a/src/sfall_config.cc
+++ b/src/sfall_config.cc
@@ -59,6 +59,7 @@ bool sfallConfigInit(int argc, char** argv)
     configSetInt(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_MOVIE_TIMER_ARTIMER4, 360);
     configSetInt(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_AUTO_QUICK_SAVE, 0);
     configSetString(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_VERSION_STRING, "");
+    configSetString(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_CONFIG_FILE, "");
 
     configSetString(&gSfallConfig, SFALL_CONFIG_SCRIPTS_KEY, SFALL_CONFIG_INI_CONFIG_FOLDER, "");
     configSetString(&gSfallConfig, SFALL_CONFIG_SCRIPTS_KEY, SFALL_CONFIG_GLOBAL_SCRIPT_PATHS, "");
diff --git a/src/sfall_config.h b/src/sfall_config.h
index 7f27c18..89402ec 100644
--- a/src/sfall_config.h
+++ b/src/sfall_config.h
@@ -73,6 +73,7 @@ namespace fallout {
 #define SFALL_CONFIG_GLOBAL_SCRIPT_PATHS "GlobalScriptPaths"
 #define SFALL_CONFIG_AUTO_QUICK_SAVE "AutoQuickSave"
 #define SFALL_CONFIG_VERSION_STRING "VersionString"
+#define SFALL_CONFIG_CONFIG_FILE "ConfigFile"
 
 #define SFALL_CONFIG_BURST_MOD_DEFAULT_CENTER_MULTIPLIER 1
 #define SFALL_CONFIG_BURST_MOD_DEFAULT_CENTER_DIVISOR 3