diff --git a/src/fios.cpp b/src/fios.cpp
--- a/src/fios.cpp
+++ b/src/fios.cpp
@@ -447,9 +447,6 @@ std::tuple<FiosType, std::string> FiosGe
 	 * .SV1 Transport Tycoon Deluxe (Patch) saved game
 	 * .SV2 Transport Tycoon Deluxe (Patch) saved 2-player game */
 
-	/* Don't crash if we supply no extension */
-	if (ext.empty()) return { FIOS_TYPE_INVALID, {} };
-
 	if (StrEqualsIgnoreCase(ext, ".sav")) {
 		return { FIOS_TYPE_FILE, GetFileTitle(file, SAVE_DIR) };
 	}
@@ -490,7 +487,7 @@ void FiosGetSavegameList(SaveLoadOperati
  * @see FiosGetFileList
  * @see FiosGetScenarioList
  */
-static std::tuple<FiosType, std::string> FiosGetScenarioListCallback(SaveLoadOperation fop, const std::string &file, const std::string_view ext)
+std::tuple<FiosType, std::string> FiosGetScenarioListCallback(SaveLoadOperation fop, const std::string &file, const std::string_view ext)
 {
 	/* Show scenario files
 	 * .SCN OpenTTD style scenario file
@@ -530,7 +527,7 @@ void FiosGetScenarioList(SaveLoadOperati
 	FiosGetFileList(fop, &FiosGetScenarioListCallback, subdir, file_list);
 }
 
-static std::tuple<FiosType, std::string> FiosGetHeightmapListCallback(SaveLoadOperation, const std::string &file, const std::string_view ext)
+std::tuple<FiosType, std::string> FiosGetHeightmapListCallback(SaveLoadOperation, const std::string &file, const std::string_view ext)
 {
 	/* Show heightmap files
 	 * .PNG PNG Based heightmap files