diff --git a/src/openrct2/drawing/sprite.cpp b/src/openrct2/drawing/sprite.cpp
index 9b75ea5644..91f9e0ba51 100644
--- a/src/openrct2/drawing/sprite.cpp
+++ b/src/openrct2/drawing/sprite.cpp
@@ -16,6 +16,7 @@
 
 #include <memory>
 #include "../common.h"
+#include "../core/File.h"
 #include "../core/FileStream.hpp"
 #include "../core/Memory.hpp"
 #include "../core/Util.hpp"
@@ -194,11 +195,22 @@ extern "C"
         safe_strcat_path(pathHeader, "Data", sizeof(pathHeader));
         safe_strcat_path(pathHeader, "csg1i.dat", sizeof(pathHeader));
 
+        // csg1.1 and csg1.dat are the same file.
+        // In the CD version, it's called csg1.1 on the CD and csg1.dat on the disk.
+        // In the GOG version, it's always called csg1.1.
+        // In the Steam version, it's always called csg1.dat.
         char pathData[MAX_PATH];
         safe_strcpy(pathData, gConfigGeneral.rct1_path, sizeof(pathData));
         safe_strcat_path(pathData, "Data", sizeof(pathData));
         safe_strcat_path(pathData, "csg1.1", sizeof(pathData));
 
+        if (!File::Exists(pathData))
+        {
+            safe_strcpy(pathData, gConfigGeneral.rct1_path, sizeof(pathData));
+            safe_strcat_path(pathData, "Data", sizeof(pathData));
+            safe_strcat_path(pathData, "csg1.dat", sizeof(pathData));
+        }
+
         try
         {
             auto fileHeader = FileStream(pathHeader, FILE_MODE_OPEN);
@@ -632,10 +644,6 @@ extern "C"
             return &_g2.elements[image_id - SPR_G2_BEGIN];
         }
 
-        if (_csg.data == nullptr)
-        {
-            gfx_load_csg();
-        }
         return &_csg.elements[image_id - SPR_CSG_BEGIN];
     }
 
diff --git a/src/openrct2/rct2.c b/src/openrct2/rct2.c
index 873d70be2a..ff5761e6f8 100644
--- a/src/openrct2/rct2.c
+++ b/src/openrct2/rct2.c
@@ -163,6 +163,7 @@ bool rct2_init()
 	if (!gfx_load_g2()) {
 		return false;
 	}
+	gfx_load_csg();
 
 	font_sprite_initialise_characters();
 	if (!gOpenRCT2Headless) {
diff --git a/src/openrct2/windows/options.c b/src/openrct2/windows/options.c
index 6d3e45930b..60d38c5448 100644
--- a/src/openrct2/windows/options.c
+++ b/src/openrct2/windows/options.c
@@ -843,12 +843,19 @@ static void window_options_mouseup(rct_window *w, sint32 widgetIndex)
 			utf8string rct1path = platform_open_directory_browser(language_get_string(STR_PATH_TO_RCT1_BROWSER));
 			if (rct1path) {
 				// Check if this directory actually contains RCT1
+				// The sprite file can be called either csg1.1 or csg1.dat, so check for both names.
 				utf8 checkpath[MAX_PATH];
 				safe_strcpy(checkpath, rct1path, MAX_PATH);
 				safe_strcat_path(checkpath, "Data", MAX_PATH);
 				safe_strcat_path(checkpath, "csg1.1", MAX_PATH);
-				if (platform_file_exists(checkpath))
-				{
+
+				if (!platform_file_exists(checkpath)) {
+					safe_strcpy(checkpath, rct1path, MAX_PATH);
+					safe_strcat_path(checkpath, "Data", MAX_PATH);
+					safe_strcat_path(checkpath, "csg1.dat", MAX_PATH);
+				}
+
+				if (platform_file_exists(checkpath)) {
 					SafeFree(gConfigGeneral.rct1_path);
 					gConfigGeneral.rct1_path = rct1path;
 					config_save_default();