diff --git a/src/script/script_instance.cpp b/src/script/script_instance.cpp
--- a/src/script/script_instance.cpp
+++ b/src/script/script_instance.cpp
@@ -27,6 +27,7 @@
 
 #include "../company_base.h"
 #include "../company_func.h"
+#include "../fileio_func.h"
 
 ScriptStorage::~ScriptStorage()
 {
@@ -104,6 +105,28 @@ void ScriptInstance::RegisterAPI()
 	squirrel_register_std(this->engine);
 }
 
+bool ScriptInstance::LoadCompatibilityScripts(const char *api_version, Subdirectory dir)
+{
+	char script_name[32];
+	seprintf(script_name, lastof(script_name), "compat_%s.nut", api_version);
+	char buf[MAX_PATH];
+	Searchpath sp;
+	FOR_ALL_SEARCHPATHS(sp) {
+		FioAppendDirectory(buf, MAX_PATH, sp, dir);
+		ttd_strlcat(buf, script_name, MAX_PATH);
+		if (!FileExists(buf)) continue;
+
+		if (this->engine->LoadScript(buf)) return true;
+
+		ScriptLog::Error("Failed to load API compatibility script");
+		DEBUG(script, 0, "Error compiling / running API compatibility script: %s", buf);
+		return false;
+	}
+
+	ScriptLog::Warning("API compatibility script not found");
+	return true;
+}
+
 ScriptInstance::~ScriptInstance()
 {
 	ScriptObject::ActiveInstance active(this);