diff --git a/src/saveload/saveload.h b/src/saveload/saveload.h
--- a/src/saveload/saveload.h
+++ b/src/saveload/saveload.h
@@ -22,25 +22,16 @@ enum SaveOrLoadResult {
 	SL_REINIT = 2, ///< error that was caught in the middle of updating game state, need to clear it. (can only happen during load)
 };
 
-/** Save or load mode. @see SaveOrLoad */
-enum SaveOrLoadMode {
-	SL_INVALID    = -1, ///< Invalid mode.
-	SL_LOAD       =  0, ///< Load game.
-	SL_SAVE       =  1, ///< Save game.
-	SL_OLD_LOAD   =  2, ///< Load old game.
-	SL_PNG        =  3, ///< Load PNG file (height map).
-	SL_BMP        =  4, ///< Load BMP file (height map).
-	SL_LOAD_CHECK =  5, ///< Load for game preview.
-};
-
 /** Deals with the type of the savegame, independent of extension */
 struct FileToSaveLoad {
-	SaveOrLoadMode mode;       ///< savegame/scenario type (old, new)
-	AbstractFileType filetype; ///< what type of file are we dealing with
-	char name[MAX_PATH];       ///< name
-	char title[255];           ///< internal name of the game
+	FileOperation file_op;           ///< File operation to perform.
+	DetailedFileType detail_ftype;   ///< Concrete file type (PNG, BMP, old save, etc).
+	AbstractFileType abstract_ftype; ///< Abstract type of file (scenario, heightmap, etc).
+	char name[MAX_PATH];             ///< Name of the file.
+	char title[255];                 ///< Internal name of the game.
 
 	void SetMode(FiosType ft);
+	void SetMode(FileOperation fop, AbstractFileType aft, DetailedFileType dft);
 };
 
 /** Types of save games. */
@@ -58,7 +49,7 @@ extern FileToSaveLoad _file_to_saveload;
 void GenerateDefaultSaveName(char *buf, const char *last);
 void SetSaveLoadError(uint16 str);
 const char *GetSaveLoadErrorString();
-SaveOrLoadResult SaveOrLoad(const char *filename, int mode, Subdirectory sb, bool threaded = true);
+SaveOrLoadResult SaveOrLoad(const char *filename, FileOperation fop, DetailedFileType dft, Subdirectory sb, bool threaded = true);
 void WaitTillSaved();
 void ProcessAsyncSaveFinish();
 void DoExitSave();